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- 20,000 Martyrs of Nicomedia
- 21 Coptic Martyrs of Libya
- Aaron
- Aaron of Aleth
- Abachum
- Abadiu of Antinoe
- Abamun of Tarnut
- Abanoub
- Abbo of Auxerre
- Abbo of Fleury
- Abbán
- Abdas of Susa
- Abdel Moati Massabki
- Abdon
- Abel of Reims
- Abercius of Hierapolis
- Aberoh and Atom
- Abhor and Mehraela
- Abibus of Edessa
- Abijah
- Abo of Tiflis
- Abra of Poitiers
- Abraham
- Abraham Kidunaia
- Abraham of Arbela
- Abraham of Clermont
- Abraham of Cratia
- Abraham of Cyrrhus
- Abraham of Pechenga
- Abraham of Rostov
- Abraham of Smolensk
- Abramius the Lover of Labor of the Kiev Caves
- Abran
- Abrosima
- Abrunculus of Trier
- Absadah
- Abudimus
- Abundius
- Acacius of Amida
- Acacius of Armenia
- Acacius of Kavsokalyvia
- Acca of Hexham
- Aceolus and Acius
- Acepsimas of Hnaita
- Acestes
- Achaicus of Corinth
- Achillas of Alexandria
- Achilleus
- Achilleus Kiwanuka
- Achillius of Larissa
- Acisclus
- Adalard of Corbie
- Adalbald of Ostrevant
- Adalbero II of Metz
- Adalbero of Würzburg
- Adalbert of Magdeburg
- Adalbert of Prague
- Adalgar
- Adalgott of Chur
- Adamo of Guglionesi
- Adauctus
- Adela of Normandy
- Adela of Pfalzel
- Adelaide of Italy
- Adelaide, Abbess of Vilich
- Adelelmus of Burgos
- Adeloga of Kitzingen
- Adelphius of Metz
- Adelphius of Remiremont
- Adheritus
- Adjutor
- Adolf of Osnabrück
- Adolphus Mukasa Ludigo
- Adomnán
- Adrian and Natalia of Nicomedia
- Adrian of Canterbury
- Adrian van Hilvarenbeek
- Adulf
- Aedesius of Alexandria
- Aelfric of Abingdon
- Aelred of Rievaulx
- Aemilianus I of Vercelli
- Aetherius of Lyon
- Aetherius of Vienne
- Afan
- Afra
- Africus
- Agabus
- Agapitus
- Agapitus of Rome
- Agapius, Atticus, Carterius, Styriacus, Tobias, Eudoxius, Nictopolion and companions
- Agatha Chon Kyong-hyob
- Agatha Kim
- Agatha Kwon Chin-i
- Agatha Lin
- Agatha Yi
- Agatha Yi Kan-nan
- Agatha Yi Kyong-i
- Agatha Yi So-sa
- Agatha of Sicily
- Agathangelus of Rome
- Agathius
- Agathoclia
- Agathon of Scetis
- Agathon of the Kiev Caves
- Agathonicus
- Agathopodes
- Agilbert
- Agilberta
- Agilulfus of Cologne
- Agilus
- Agnellus of Pisa
- Agnes Kim Hyo-ju
- Agnes Lê Thị Thành
- Agnes Tsao Kou Ying
- Agnes of Assisi
- Agnes of Montepulciano
- Agnes of Poitiers
- Agnes of Prague
- Agnes of Rome
- Agobard
- Agostina Livia Pietrantoni
- Agostino Roscelli
- Agricius of Trier
- Agricola
- Agricola of Avignon
- Agrippina of Mineo
- Agrippinus of Naples
- Agustín Caloca Cortés
- Ahmet the Calligrapher
- Aibert
- Aichardus
- Aidan of Lindisfarne
- Aignan of Orleans
- Ailbe of Emly
- Aileran
- Aimo of Meda
- Akakios of Liti and Rendini
- Alan of Balmerino
- Alban Roe
- Alban of Britain
- Alban of Mainz
- Alberic Crescitelli
- Alberic of Cîteaux
- Alberic of Utrecht
- Albert of Genoa
- Albert of Jerusalem
- Albert of Louvain
- Albert of Montecorvino
- Albert of Trapani
- Albert the Great
- Alberto Adamo Chmielowski
- Alberto Hurtado Cruchaga
- Albinus of Angers
- Alchmund of Hexham
- Alcuin of York
- Aldebrandus
- Aldegund of Maubeuge
- Aldhelm
- Alena
- Alessandro Sauli
- Alexander Briant
- Alexander Hotovitzky
- Alexander Schmorell
- Alexander of Alexandria
- Alexander of Bergamo
- Alexander of Comana
- Alexander of Constantinople
- Alexander of Jerusalem
- Alexander of Lyons
- Alexander the Acoemete
- Alexis Falconieri
- Alexis Toth
- Alexius U Se-yong
- Alexius of Rome
- Alexius the Recluse of the Kiev Caves
- Alfonso Maria Fusco
- Alfonso Rodríguez Olmedo
- Alice of Schaerbeek
- Alkmund of Derby
- Alonso de Orozco
- Aloysius Gonzaga
- Alphege the Bald
- Alphonsa of the Immaculate Conception
- Alphonsus Liguori
- Alphonsus Rodriguez
- Alto of Altomünster
- Alypius of Thagaste
- Amabilis of Riom
- Amadeus of Lausanne
- Amadio degli Amidei
- Amalberga of Maubeuge
- Amalberga of Temse
- Amandina of Schakkebroek
- Amandus
- Amantius of Como
- Amata of Assisi
- Amato Ronconi
- Amator
- Amatus
- Amatus of Remiremont
- Ambrose Barlow
- Ambrose Kibuuka
- Ambrose of Alexandria
- Ambrose of Milan
- Ambrósio Francisco Ferro
- Ammon the Recluse of the Kiev Caves
- Ammonas of Egypt
- Amos
- Ampelus
- Amphibalus
- Amphilochios of Patmos
- Amphilochius of Iconium
- Amun of Nitria
- Amunia of San Millán
- Anacletus
- Ananias of Damascus
- Anastasia
- Anastasia of Serbia
- Anastasia of Sirmium
- Anastasia the Patrician
- Anastasia Șaguna
- Anastasius Sinaita
- Anastasius of Pavia
- Anastasius of Rome
- Anastasius of Suppentonia
- Anastasius the Deacon of the Kiev Caves
- Anastasius the Fuller
- Anastasius the Persian
- Anathalon of Milan
- Anatoli Kiriggwajjo
- Anatolia
- Anatolius of Constantinople
- Anatolius of Laodicea
- Andrea Avellino
- Andrea Bobola
- Andrea Corsini
- Andrea Dotti
- Andrea Uberto Fournet
- Andreas Wang Tianqing
- Andrew
- Andrew Chong Hwa-gyong
- Andrew Dũng-Lạc
- Andrew Kaggwa
- Andrew Kim Tae-gon
- Andrew Nguyễn Kim Thông
- Andrew Stratelates
- Andrew Trần Văn Trông
- Andrew Tường
- Andrew Wouters
- Andrew Zorard
- Andrew of Crete
- Andrew the Scot
- Andronicus
- André Bauer
- André Bessette
- André de Soveral
- Angadrisma
- Angela Merici
- Angela of Foligno
- Angela of the Cross
- Angelelmus
- Angelina of Serbia
- Angelus of Jerusalem
- Angilbert
- Anianus of Alexandria
- Aniceto Adolfo
- Ann An Jiaoshi
- Ann An Xingshi
- Anna Kim Chang-gum
- Anna Pak A-gi
- Anna Schäffer
- Anna Wang
- Anna the Prophetess
- Anne
- Anne Line
- Annibale Maria di Francia
- Anno II
- Ansanus
- Ansbert
- Ansegisus
- Anselm of Canterbury
- Anselm of Lucca
- Ansfried of Utrecht
- Ansgar
- Ansovinus
- Anstrudis
- Ansurius
- Anthelm of Belley
- Anthimos of Chios
- Anthimus of Nicomedia
- Anthimus of Rome
- Anthony Dainan
- Anthony Fantosati
- Anthony Kim Song-u
- Anthony Mary Claret
- Anthony Mary Zaccaria
- Anthony Nguyen Huu Quynh
- Anthony of Egypt
- Anthony of Hoornaar
- Anthony of Kiev
- Anthony of Lérins
- Anthony of Padua
- Anthony of St. Ann Galvão
- Anthony of Weert
- Anthusa of Constantinople
- Antia of Illyria
- Antiochus of Sulcis
- Antipas of Pergamum
- Antipope Felix II
- Antoine Daniel
- Antoine Daveluy
- Anton Martin Slomšek
- Antonina of Tismana
- Antoninus of Florence
- Antoninus of Piacenza
- Antoninus of Rome
- Antoninus of Sorrento
- Antonio González
- Antonio Maria Gianelli
- Antonio Maria Pucci
- Antonio de Badajoz
- Antonio of Tlaxcala
- Antônio Baracho
- Antônio Vilela
- Antônio Vilela Cid
- Anysia of Salonika
- Aphian
- Aphrahat
- Aphrodisius of Africa
- Apollinaris Claudius
- Apollinaris Syncletica
- Apollinaris of Ravenna
- Apollinaris of Valence
- Apollonia of Alexandria
- Apollonius the Apologist
- Apollos
- Apphia
- Apronia of Toul
- Apronian of Rome
- Aprunculus of Clermont
- Aprus of Toul
- Aquila
- Aquila of the Kiev Caves
- Aquilina of Byblos
- Aquilinus of Fossombrone
- Aquilinus of Milan
- Aquilinus of Évreux
- Arbogast
- Arcadius of Bourges
- Arcadius of Mauretania
- Arcangelo Tadini
- Archippus
- Aredius
- Arethas of Najran
- Arey of Gap
- Argeus of Tomi
- Ariadne of Phrygia
- Arialdo
- Arilda of Oldbury
- Aristides of Athens
- Aristobulus of Britannia
- Armogastes
- Arnold Janssen
- Arnold of Arnoldsweiler
- Arnold of Soissons
- Arnulf of Metz
- Arsenius of Iqalto
- Arsenius of Paros
- Arsenius the Great
- Arsenius the Lover of Labor of the Kiev Caves
- Artaldus
- Artemide Zatti
- Artemius
- Arthelais
- Asaph
- Ascelina
- Asclepiades of Antioch
- Asella
- Aspren
- Assicus
- Asteria of Bergamo
- Asterius of Amasea
- Asterius of Petra
- Astius
- Athanasia of Aegina
- Athanasios Hamakiotis
- Athanasius Bazzekuketta
- Athanasius I of Constantinople
- Athanasius Parios
- Athanasius of Alexandria
- Athanasius of Medikion
- Athanasius of Meteora
- Athanasius of Paulopetrion
- Athanasius the Athonite
- Athanasius the Recluse of the Kiev Far Caves
- Athelm
- Athenagoras of Athens
- Athracht
- Atilano Cruz Alvarado
- Attala of Bobbio
- Attilanus
- Audax
- Audifax
- Audoin of Rouen
- Audomar of Thérouanne
- Augulus
- Augusta of Serravalle
- Auguste Chapdelaine
- Augustin Schoeffler
- Augustine Nguyễn Văn Mới
- Augustine Pak Chong-won
- Augustine Phan Viết Huy
- Augustine Webster
- Augustine Yi Kwang-hon
- Augustine Yu Chin-gil
- Augustine Zhao Rong
- Augustine of Canterbury
- Augustine of Hippo
- Augusto Andrés
- Aunarius of Auxerre
- Aurea of Ostia
- Aurea of Paris
- Aurelian of Limoges
- Aurelius of Carthage
- Aurelius of Córdoba
- Aureus of Mainz
- Auspicius of Toul
- Austrebertha
- Austregisilus
- Austromoine
- Autonomus
- Auxentius of Bithynia
- Auxentius of Mopsuestia
- Avertinus of Tours
- Avilius of Alexandria
- Avitianus
- Avitus of Perche
- Avitus of Vienne
- Aye
- Aymard of Cluny
- Azariah
- Babylas of Antioch
- Bacchus
- Bademus
- Baithéne mac Brénaind
- Balbina of Rome
- Baldassare Ravaschieri
- Balderic of Montfaucon
- Baldred of Tyninghame
- Baldwin of Rieti
- Bantus of Trier
- Baradates
- Barbara
- Barbara Cho Chung-i
- Barbara Choe Yong-i
- Barbara Cui Lianshi
- Barbara Han A-gi
- Barbara Kim
- Barbara Ko Sun-i
- Barbara Kwon Hui
- Barbara Yi
- Barbara Yi Chong-hui
- Barbatus of Benevento
- Barhadbesciabas
- Barlaam
- Barnabas
- Barsanuphius
- Barsimaeus
- Bartholomew
- Bartholomew Chong Mun-ho
- Bartholomew of Braga
- Bartholomew of Farne
- Bartolomea Capitanio
- Baruch
- Barulas
- Basil Martysz
- Basil of Amasea
- Basil of Ancyra
- Basil of Ostrog
- Basil of Parium
- Basil the Confessor of Decapolis
- Basil the Elder
- Basil the Great
- Basilides
- Basiliscus of Comana
- Basilissa
- Basilla of Rome
- Basinus of Trier
- Bassianus of Lodi
- Bathilde
- Baudolino
- Bavo of Ghent
- Beatrice of Silva
- Beatrix
- Beatus of Liébana
- Beatus of Lungern
- Bede the Venerable
- Bega of St Bees
- Begga
- Belina
- Bellinus of Padua
- Benedetta Cambiagio Frassinello
- Benedict Biscop
- Benedict Joseph Labre
- Benedict Menni
- Benedict dell'Antella
- Benedict of Aniane
- Benedict of Cagliari
- Benedict of Nursia
- Benedict of Szkalka
- Benedict the Moor
- Benedicta Hyon Kyong-nyon
- Benignus of Armagh
- Benignus of Dijon
- Benignus of Fontenelle
- Benignus of Todi
- Benildus Romançon
- Benjamin
- Benjamin of the Kiev Caves
- Benjamín Julián
- Benno
- Benvenutus Scotivoli
- Berard of Carbio
- Berardo of the Marsi
- Bercharius of Hautvillers
- Berlinda of Meerbeke
- Bernadette Soubirous
- Bernard Vũ Văn Duệ
- Bernard degli Uberti
- Bernard of Carinola
- Bernard of Clairvaux
- Bernard of Corleone
- Bernard of Menthon
- Bernard of Rodez
- Bernard of Thiron
- Bernard of Valdeiglesias
- Bernardine of Siena
- Bernardino Realino
- Bernardo Tolomei
- Bernat Calbó
- Bernward of Hildesheim
- Bertha of Bingen
- Bertha of Val d'Or
- Bertharius of Monte Cassino
- Berthold of Parma
- Bertilia
- Bertin
- Bertrand of Comminges
- Bertulf of Bobbio
- Bessarion of Egypt
- Betharius of Chartres
- Beuno
- Bibiana
- Birillus
- Birinus
- Blaesilla
- Blaise
- Blandina of Iași
- Blandina of Lyon
- Blane
- Blas Rodríguez de Cuacos
- Blathmac
- Bodfan
- Boethius
- Boisil
- Bonaventure
- Bonaventure of Miyako
- Bonfilius
- Boniface of Brussels
- Boniface of Mainz
- Boniface of Tarsus
- Bonifacia Rodríguez de Castro
- Bonitus of Clermont
- Bonitus of Montecassino
- Bononio
- Bonosa of Porto
- Bonosus of Trier
- Boris I of Bulgaria
- Bosa of York
- Botulph of Thorney
- Brannoc of Braunton
- Branwalator
- Braulio of Zaragoza
- Bregowine
- Brendan of Birr
- Brendan the Navigator
- Bretannio
- Brice of Tours
- Bridget of Kildare
- Bridget of Sweden
- Brihtwald of Wilton
- Brioc
- Britta of Tours
- Britto of Trier
- Brocard
- Bruno Sserunkuuma
- Bruno of Cologne
- Bruno of Querfurt
- Bruno of Saxony
- Bruno of Segni
- Bruno of Würzburg
- Bruno the Great
- Brynach of Nevern
- Brynolf Algotsson
- Brónach
- Bucolus of Smyrna
- Budoc of Dol
- Buonfiglio Monaldi
- Burchard of Würzburg
- Buriana
- Bécán
- Bénézet
- Cadfan of Tywyn
- Cadoc of Llancarfan
- Caecilia of Remiremont
- Caesaria the Elder
- Caesaria the Younger
- Caesarius of Arles
- Caesarius of Nazianzus
- Caesarius of Terracina
- Caillín of Fenagh
- Cainnech of Aghaboe
- Caius of Milan
- Caius of Saragossa
- Cajetan
- Caleb
- Calepodius
- Caletric of Chartres
- Calimerius
- Callinicus I of Constantinople
- Callistus Caravario
- Callistus I
- Callistus I of Constantinople
- Callixtus of Todi
- Calminius of Mozac
- Calocerus
- Calogerus the Anchorite
- Camilla Battista da Varano
- Camillus de Lellis
- Candida the Elder
- Candidus
- Candidus of Thebes
- Canius
- Cantius, Cantianus and Cantianilla
- Canute Lavard
- Caprasius of Agen
- Caprasius of Lérins
- Caradoc of Wales
- Caraunus
- Carilefus of Anisole
- Carlo Acutis
- Carmelo Bolta Bañuls
- Carmen Sallés y Barangueras
- Carolina Santocanale
- Carpus of Beroea
- Carthage the Elder
- Casilda of Toledo
- Casimir of Poland
- Cassian of Autun
- Cassian of Imola
- Cassian of Tangier
- Cassius of Clermont
- Cassius of Narni
- Castor of Apt
- Castor of Karden
- Castritian
- Castulus
- Catald of Taranto
- Catellus of Castellammare
- Caterina Volpicelli
- Cathan
- Catherine Chong Chor-yom
- Catherine Labouré
- Catherine Yi
- Catherine of Alexandria
- Catherine of Bologna
- Catherine of Genoa
- Catherine of Palma
- Catherine of Ricci
- Catherine of Siena
- Catherine of Sweden
- Cecilia
- Cecilia Yu So-sa
- Cedd
- Cellach of Armagh
- Celsus
- Cermanus of Cádiz
- Cesidio Giacomantonio
- Cessianus
- Chad of Mercia
- Charbel Makhlouf
- Charbel of Edessa
- Charles Borromeo
- Charles Cho Shin-chol
- Charles Garnier
- Charles Hyon Song-mun
- Charles Lwanga
- Charles de Foucauld
- Charles of Mount Argus
- Charles of Sezze
- Chelidonia
- Chi Zhuzi
- Chiara Badano
- Chlodulf of Metz
- Christian of Clogher
- Christina of Bolsena
- Christopher
- Chrodegang of Metz
- Chromatius of Aquileia
- Chrysogonus
- Ciarán of Clonmacnoise
- Ciarán of Saigir
- Cirilo Bertrán
- Clare of Assisi
- Clare of Montefalco
- Clare of Rimini
- Clateus
- Claude La Colombière
- Claudine Thévenet
- Claudius of Besançon
- Clelia Barbieri
- Clelia Nanetti
- Clement Mary Hofbauer
- Clement of Ancyra
- Clement of Metz
- Clement of Ohrid
- Clement of Rome
- Clemente Ignacio Delgado Cebrián
- Cleopatra
- Clodoald of Saint-Cloud
- Clotilde
- Colette of Corbie
- Colman mac Duagh
- Colmán of Cloyne
- Coloman of Stockerau
- Columba Kim Hyo-im
- Columban of Luxeuil
- Conchita Barrecheguren
- Concordius of Spoleto
- Condède of Belcinac
- Conrad of Constance
- Conrad of Parzham
- Conrad of Piacenza
- Constantine the Great
- Constantius of Perugia
- Coprius of Pechenga
- Corbinian
- Corebus
- Cornelius of Wijk bij Duurstede
- Cornelius the Centurion
- Cosmas
- Cosmas I of Constantinople
- Cosmas Takeya
- Cosmas of Chalcedon
- Cosmas of Maiuma
- Credan of Evesham
- Crescentian of Torres
- Crescentinus
- Crescentius of Florence
- Crescentius of Rome
- Crescentius of Saragossa
- Crispin I of Pavia
- Crispin of Soissons
- Crispin of Viterbo
- Crispoltus of Bettona
- Cristiolus of Wales
- Cristóbal Magallanes Jara
- Cristóbal of Tlaxcala
- Cunibert of Cologne
- Cunigunde of Luxembourg
- Cuthbert Mayne
- Cuthbert of Canterbury
- Cuthbert of Lindisfarne
- Cyprian of Carthage
- Cyriacus
- Cyriacus of Satala
- Cyril of Alexandria
- Cyril of Jerusalem
- Cyril of Novoezersk
- Cyril of Thessalonica
- Cyril of Turov
- Cyrillus of Trier
- Cyrinus of Rome
- Cándida María de Jesús
- Cædmon of Whitby
- César de Bus
- Dabheog
- Dagobert II of Austrasia
- Dalmatius of Pavia
- Dalmatus of Constantinople
- Damaris of Athens
- Damaskinos the Studite
- Damasus I
- Damian
- Damian Nam Myong-hyok
- Damian of Pavia
- Damien of Molokai
- Daniel
- Daniel II of Serbia
- Daniel and Companions
- Daniel of Katounakia
- Daniel of Padua
- Daniel the Hesychast
- Daniele Comboni
- Darerca of Ireland
- Darius
- Dathus
- David
- David Galván Bermúdez
- David Lewis
- David Roldán Lara
- David Uribe Velasco
- David of Munktorp
- David the Dendrite
- Deborah
- Demetrius of Thessaloniki
- Denis
- Denis Ssebuggwawo Wasswa
- Deodat of Rodez
- Deodatus of Nevers
- Desideratus of Bourges
- Devasahayam Pillai
- Devota
- Diadochos of Photiki
- Didacus of Alcalá
- Didymus of Alexandria
- Diodorus of Tarsus
- Diogo Pereira
- Diomedes of Tarsus
- Dionysios of Olympus
- Dionysios of Zakynthos
- Dionysius of Alexandria
- Dionysius of Corinth
- Dionysius of Vienne
- Dionysius the Areopagite
- Dionysius the Recluse of the Kiev Caves
- Dismas
- Dodon of Wallers
- Domingo Henares de Zafra Cubero
- Domingo Ibáñez de Erquicia
- Domingos Carvalho
- Dominic Bùi Van Úy
- Dominic Cẩm
- Dominic Huyện
- Dominic Mậu
- Dominic Nguyên
- Dominic Nguyễn Văn Hạnh
- Dominic Nguyễn Văn Xuyên
- Dominic Nguyễn Đức Mạo
- Dominic Nhi
- Dominic Ninh
- Dominic Pham Trong Kham
- Dominic Savio
- Dominic Toại
- Dominic Trạch Đoài
- Dominic Vũ Đình Tước
- Dominic de Guzmán
- Dominic de la Calzada
- Dominic of Silos
- Dominic Đinh Đạt
- Domitian of Carantania
- Domninus of Vienne
- Domnius
- Domnolus of Le Mans
- Domnolus of Vienne
- Donatus of Euroea
- Donatus of Fossombrone
- Dorothea of Alexandria
- Dorothea of Caesarea
- Dorotheus of Gaza
- Dorothy Day
- Dorothy of Montau
- Dositheus of Gaza
- Doulchard of Bourges
- Drogo of Sebourg
- Dubricius
- Dulce Lopes Pontes
- Dymphna
- Ebrulf of Ouche
- Edith Stein
- Edmund Arrowsmith
- Edmund Campion
- Edmund Gennings
- Edmund of Abingdon
- Edmund the Martyr
- Edward the Confessor
- Edward the Martyr
- Egidio Maria of Saint Joseph
- Elena Guerra
- Eleuchadius
- Eleutherius of Illyria
- Elia Facchini
- Elias of Enna
- Elias of Palestine
- Elias the Cave-Dweller
- Elijah
- Elisabeta (Safta) Brâncoveanu
- Elisabeta of Pasărea
- Elisabeth Chong Chong-hye
- Elisha
- Elizabeth Ann Seton
- Elizabeth Hesselblad
- Elizabeth Qin Bianshi
- Elizabeth of Hungary
- Elizabeth of Portugal
- Elizabeth of the Trinity
- Eluned
- Elzéar of Sabran
- Emerentiana
- Emeric of Hungary
- Emilian of Cyzicus
- Emma of Lesum
- Emmanuel Lê Văn Phụng
- Emmanuel Nguyễn Văn Triệu
- Emygdius
- Engelbert Kolland
- Engratia of Zaragoza
- Enoch
- Enrique de Ossó i Cervelló
- Epaphras of Colossae
- Ephraim of Antioch
- Ephraim of Katounakia
- Ephraim of Pereyaslavl
- Ephraim of Serbia
- Ephraim of Smolensk
- Ephrem the Syrian
- Epimachus
- Epiphanius of Salamis
- Epitacius
- Erasmus
- Erasmus of the Kiev Caves
- Erembert of Toulouse
- Erhard of Regensburg
- Eric IX of Sweden
- Erlembald
- Ermelinde of Meldert
- Estêvão Machado de Miranda
- Ethelhard of Canterbury
- Ethelnoth of Canterbury
- Etienne-Théodore Cuenot
- Eucherius of Lyon
- Eudokia of Heliopolis
- Eugendus
- Eugenios Giannoulis the Aitolos
- Eugenius II of Toledo
- Eugenius of Florence
- Eugippius of Lucullanum
- Eugène de Mazenod
- Eugénie of Alsace
- Eulalia of Barcelona
- Eulalia of Mérida
- Eulogius of Córdoba
- Eumenios Saridakis
- Eumenius of Gortyna
- Euphemia
- Euphrasia Eluvathingal
- Euphrosyne of Alexandria
- Euphrosyne of Polotsk
- Euphrosynus of Pskov
- Euphrosynus the Cook
- Euprepius of Verona
- Euschemon of Lampsacus
- Eusebia of Hamage
- Eusebius of Bologna
- Eusebius of Milan
- Eusebius of Rome
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- Eustace
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- Eustadiola of Bourges
- Eustathius I of Serbia
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- Evellius
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- Evodius
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- Ezekiel
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- Ezra
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- Faustina Kowalska
- Faustinus
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- Ferdinand III of Castile
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- Firmus of Satala
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- Flavia Domitilla
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- Franca da Vitalta
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- Frances of Rome
- Francesco Fogolla
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- Fulton J. Sheen
- Fursey
- Gabriel Lalemant
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- Gad
- Gaetano Catanoso
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- Galdino of Milan
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- Galle of Valence
- Gamaliel
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- Gaudiosus of Tarazona
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- Gausbert of Montsalvy
- Gauzelin of Toul
- Gebhard of Constance
- Gelasius I
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- Geminianus
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- Gemma Galgani
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- Genesius of Arles
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- Gennadius I of Constantinople
- Gennadius of Novgorod
- Genoveva Torres Morales
- George
- George Preca
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- Gerald of Sauve-Majeure
- Gerard Majella
- Gerard of Potenza
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- Gerasimus of Cephalonia
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- Gerbold of Bayeux
- Gerhard of Csanád
- Germain of Paris
- Germaine Cousin
- Germanicus of Smyrna
- Germanos Maroules
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- Germer of Flay
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- Gerontius of Cervia
- Gerontius of Milan
- Gerontius the Canonarch of the Kiev Caves
- Gertrude of Nivelles
- Gertrude the Great
- Gervasios of Patras
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- Getulius
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- Gideon
- Gilbert of Sempringham
- Giles
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- Giordano Ansaloni
- Giovanni Antonio Farina
- Giovanni Battista Piamarta
- Giovanni Battista Scalabrini
- Giovanni Battista de' Rossi
- Giovanni Calabria
- Giuditta Vannini
- Giulia Salzano
- Giuseppe Allamano
- Giuseppe Benedetto Cottolengo
- Giuseppe Maria Tomasi
- Giuseppe Moscati
- Giustino Russolillo
- Giustino de Jacobis
- Gleb of Rus
- Glossinde of Metz
- Glyceria of Heraclea
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- Gobain of Voas
- Gobnait
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- Godfrey of Savigny
- Godfried Coart
- Godfried van Duynen
- Gohard of Nantes
- Gonsalo Garcia
- Gonzaga Gonza
- Gordaine of Anchin
- Gordianus
- Gordius of Caesarea
- Gorgonia of Nazianzus
- Gorgonius of Rome
- Gotthard of Hildesheim
- Goëry of Metz
- Greca of Decimomannu
- Gregorio Barbarigo
- Gregorio Grassi
- Gregory Thaumaturgus
- Gregory of Decapolis
- Gregory of Langres
- Gregory of Narek
- Gregory of Nazianzus
- Gregory of Nyssa
- Gregory of Sinai
- Gregory the Great
- Gregory the Iconographer of the Kiev Caves
- Gregory the Illuminator
- Gregory the Recluse of the Kiev Caves
- Gregory the Wonderworker of the Kiev Caves
- Gualfard of Verona
- Guarinus of Palestrina
- Gudula of Brussels
- Guido Maria Conforti
- Guillaume Courtet
- Gummarus of Lier
- Gundulf of Maastricht
- Gundulf of Metz
- Gyavira Musoke
- Habakkuk
- Hadelin of Celles
- Hamo of Savigny
- Hedwig of Silesia
- Hegesippus
- Helena of Constantinople
- Helena of Skövde
- Heliodorus of Altino
- Hemma of Gurk
- Henri Dorie
- Henry II
- Henry Morse
- Henry Walpole
- Henry of Uppsala
- Herculanus of Brescia
- Herculanus of Perugia
- Herculanus of Porto
- Heribert of Cologne
- Herman of Alaska
- Hermann Joseph
- Hermenegild
- Hermes of Moesia
- Hermias of Comana
- Hermione of Ephesus
- Hervé of Brittany
- Hesperius of Metz
- Hesychius I of Vienne
- Hesychius II of Vienne
- Hesychius of Jerusalem
- Hidulf of Moyenmoutier
- Hilarion of Ancyra
- Hilarion the Georgian
- Hilarion the Great
- Hilarion the New
- Hilarion the Schemamonk of the Kiev Caves
- Hilary of Poitiers
- Hildegard of Bingen
- Hiltrude of Liessies
- Hippolytus of Rome
- Homobonus of Cremona
- Honoratus of Amiens
- Honoratus of Arles
- Honorina
- Honorius of Canterbury
- Hosea
- Hripsime
- Hubertus
- Hugh dei Lippi Uggucioni
- Hugh of Bonnevaux
- Hugh of Châteauneuf
- Hugh of Cluny
- Hugh of Lincoln
- Humilis of Bisignano
- Hunegund of Homblières
- Hunna of Hunawihr
- Hyacinth of Caesarea
- Hyacinth of Poland
- Hyacinth of Rome
- Hyacintha Mariscotti
- Hyginus
- Hypatius of Gangra
- Hypatius of Rufinianae
- Hypatius the Healer of the Kiev Caves
- Héctor Valdivielso Sáez
- Ia of Cornwall
- Iakovos Tsalikis
- Ida of Herzfeld
- Ignatius Kim Che-jun
- Ignatius of Antioch
- Ignatius of Batheos Ryakos
- Ignatius of Laconi
- Ignatius of Loma
- Ignatius of Loyola
- Ignatius of Rostov
- Ignatius of Santhià
- Ignatius of Smolensk
- Ignatius of the Kiev Caves
- Ignazia Verzeri
- Ildefonsus of Toledo
- Ingrid of Skänninge
- Innocent of Alaska
- Inocencio of Mary Immaculate
- Irais of Alexandria
- Irenaeus of Lyon
- Irene of Rome
- Irene of Tomar
- Irmina of Oeren
- Isaac
- Isaac Jogues
- Isaac of Armenia
- Isaac of Nineveh
- Isaac of Stella
- Isaac of the Dalmatian Monastery
- Isaiah
- Isarn of Marseille
- Isfrid of Ratzeburg
- Isidora of Tabenna
- Isidore Boucheir
- Isidore of Pelusium
- Isidore of Seville
- Isidore the Farmer
- Ita of Killeedy
- Ithamar of Rochester
- Ivo of Chartres
- Ivo of Kermartin
- Jacinta Marto
- Jacinto Castañeda
- Jacob
- Jacob of Alaska
- Jacob of Nisibis
- Jacob of Serbia
- Jacob of Serugh
- Jacobo Kyushei Tomonaga
- Jacques Berthieu
- Jacques Chastan
- Jadwiga of Poland
- Jaime Hilario Barbal
- James (son of Alphaeus)
- James (son of Zebedee)
- James Buuzaabalyaawo
- James Kisai
- James Lacops
- James Năm
- James Yan Guodong
- James Zhao Quanxin
- James of the Marches
- James the Just
- Jan Sarkander
- Jan of Oisterwijk
- Jane Frances de Chantal
- Januarius of Naples
- Jason of Thessalonica
- Jean de Lalande
- Jean-Charles Cornay
- Jean-Louis Bonnard
- Jean-Pierre Néel
- Jeanne Delanoue
- Jeanne Jugan
- Jeanne de Lestonnac
- Jeanne-Antide Thouret
- Jenaro Sánchez Delgadillo
- Jeremiah
- Jeremiah the Clairvoyant of the Kiev Caves
- Jerome
- Jerome Emiliani
- Jerome Lu Tingmei
- Jerome of Weert
- Jerónimo Hermosilla
- Jesús Méndez Montoya
- Joachim
- Joachim Ho
- Joachim Royo
- Joachim Sakakibara
- Joan Elizabeth Bichier des Âges
- Joan of Arc
- Joan of France
- Joaquina Vedruna de Mas
- Joasaph of Meteora
- Job
- Joel
- John (son of Zebedee)
- John Alcober
- John Almond
- John Baptist Chon Chang-un
- John Baptist Cỏn
- John Baptist Luo Tingyin
- John Baptist Nam Chong-sam
- John Baptist Wu Mantang
- John Baptist Zhao Mingxi
- John Baptist Zhu Wurui
- John Baptist de La Salle
- John Baptist of the Conception
- John Berchmans
- John Bosco
- John Boste
- John Buonagiunta Monetti
- John Cantius
- John Cassian
- John Chen Xianheng
- John Chrysostom
- John Eudes
- John Fisher
- John Francis Regis
- John Gabriel Perboyre
- John Gualbert
- John Henry Newman
- John Houghton
- John Jones
- John Joseph of the Cross
- John Kemble
- John Kisaka
- John Kochurov
- John Leonardi
- John Lloyd
- John Macías
- John Maron
- John Mary Muzeeyi
- John Maximovitch
- John Neumann
- John Ogilvie
- John Paine
- John Pak Hu-jae
- John Paul II
- John Plessington
- John Rigby
- John Roberts
- John Soan de Goto
- John Southworth
- John Stone
- John Twenge
- John V of Constantinople
- John Vianney
- John Wall
- John Wang Kuixin
- John Wang Rui
- John Wu Wenyin
- John XXIII
- John Yi Mun-u
- John Yi Yun-il
- John Zhang Huan
- John Zhang Jingguang
- John Zhang Tianshen
- John de Britto
- John de Brébeuf
- John of Beverley
- John of Capistrano
- John of Chalcedon
- John of Cologne
- John of Damascus
- John of Dukla
- John of God
- John of Kathara
- John of Kazan
- John of Matha
- John of Nepomuk
- John of Sahagún
- John of Triora
- John of Trogir
- John of Tufara
- John of Uglich
- John of Valence
- John of the Cross
- John of Ávila
- John the Baptist
- John the Baptist Yi Kwang-nyol
- John the Hairy of Rostov
- John the Prophet of Gaza
- John the Solitary of Jerusalem
- John Đinh Văn Thanh
- John Đoàn Trinh Hoan
- John Đạt
- John, disciple of Gregory of Decapolis
- Jonah
- Josaphat Kuntsevych
- Josemaría Escrivá
- Josep Manyanet y Vives
- Joseph
- Joseph Cafasso
- Joseph Calasanz
- Joseph Chang Chu-gi
- Joseph Chang Song-jip
- Joseph Cho Yun-ho
- Joseph Freinademetz
- Joseph Han Chae-kwon
- Joseph Hoàng Lương Cảnh
- Joseph Im Chi-baeg
- Joseph Khang Duy Nguyen
- Joseph Lê Đăng Thị
- Joseph Ma Taishun
- Joseph Marchand
- Joseph Marello
- Joseph Mary Gambaro
- Joseph Mukasa Balikuddembe
- Joseph Nguyễn Văn Lựu
- Joseph Nguyễn Đình Nghi
- Joseph Nguyễn Đình Uyển
- Joseph Oriol
- Joseph Phạm Trọng Tả
- Joseph Pignatelli
- Joseph Trần Văn Tuấn
- Joseph Tuc
- Joseph Tuân
- Joseph Vaz
- Joseph Volotsky
- Joseph Wang Kuiju
- Joseph Wang Yumei
- Joseph Yuan
- Joseph Yuan Gengyin
- Joseph Zhang Dapeng
- Joseph Zhang Wenlan
- Joseph of Anchieta
- Joseph of Arimathea
- Joseph of Cupertino
- Joseph of Leonessa
- Joseph of Nazareth
- Joseph of Thessalonica
- Joseph of Zaonikiev
- Joseph the Hesychast
- Joseph the Hymnographer
- Joseph the Much-Ailing of the Kiev Caves
- Joseph Đặng Đình Viên
- Joseph Đỗ Quang Hiển
- Josephine Bakhita
- Joshua
- José Fernández
- José Gabriel Brochero
- José Isabel Flores Varela
- José María Díaz Sanjurjo
- José María Robles Hurtado
- José María Rubio
- José María de Yermo y Parres
- José Sánchez del Río
- José do Porto
- Jovita
- João Lostau Navarro
- João Martins
- João da Silveira
- Juan Diego
- Juan Grande Román
- Juan Jacobo Fernández
- Juan de Ribera
- Juan del Castillo
- Juan of Tlaxcala
- Judith
- Julia of Corsica
- Julian of Antioch
- Julian of Cuenca
- Julian of Le Mans
- Julian of Mesopotamia
- Julian of Sora
- Juliana Falconieri
- Juliana of Liège
- Juliana of Nicomedia
- Juliana of Norwich
- Julie Billiart
- Julietta Kim
- Julio Álvarez Mendoza
- Julius of Novara
- Julius of Rome
- Julián Alfredo
- Junípero Serra
- Justin Martyr
- Justin of Chieti
- Justina of Padua
- Justino Orona Madrigal
- Justus Ranfer de Bretenières
- Justus of Canterbury
- Justus of Urgell
- Juvenal of Narni
- Juvenaly of Alaska
- Jón Ögmundsson
- Józef Bilczewski
- Józef Sebastian Pelczar
- Kalliopi
- Kallistos Angelikoudes
- Kateri Tekakwitha
- Katharine Drexel
- Kilian
- Kinga of Poland
- Kizito
- Knud IV of Denmark
- Kuksha of the Kiev Caves
- Kunigunde of Rapperswil
- Kuriakose Elias Chavara
- Ladislaus I of Hungary
- Laetus of Micy
- Lambert of Maastricht
- Lambert of Saragossa
- Landelin of Crespin
- Landry of Paris
- Largus of Rome
- Latuin of Séez
- Laud of Coutances
- Laumer of Corbion
- Laura Montoya
- Laurence Han I-hyong
- Laurence Imbert
- Laurence Wang Bing
- Laurence of Turov
- Laurentia
- Lawrence
- Lawrence Bai Xiaoman
- Lawrence Giustiniani
- Lawrence Nguyễn Văn Hưởng
- Lawrence Ngôn
- Lawrence of Brindisi
- Lazarus of Bardiaboch
- Lazarus of Bethany
- Lazarus of Kyoto
- Leander of Seville
- Leo Karasumaru
- Leo Luke of Corleone
- Leo of Montefeltro
- Leo the Great
- Leoba
- Leobinus of Chartres
- Leocadia
- Leodegar of Autun
- Leonard of Noblac
- Leonard of Port Maurice
- Leonard van Veghel
- Leonardo Murialdo
- Leontius of Trier
- Leontius the Canonarch of the Kiev Caves
- Leopold III
- Leopold Mandić
- Leucius of Brindisi
- Leutfridus
- Liberalis of Treviso
- Liberius I of Ravenna
- Libert of Saint-Trond
- Liborius of Le Mans
- Licinius of Angers
- Lidwina of Schiedam
- Liliosa of Córdoba
- Linus
- Liphard of Meung
- Liutwin of Trier
- Livinus
- Lodovico Pavoni
- Longinus
- Longinus of Satala
- Longinus the Gatekeeper of the Kiev Caves
- Lorcán Ua Tuathail
- Lorenzo Ruiz
- Louis Beaulieu
- Louis Bertrand
- Louis IX of France
- Louis Ibaraki
- Louis Martin
- Louis de Montfort
- Louise de Marillac
- Lubentius
- Luca Antonio Falcone
- Lucia Kim
- Lucia Kim Kop-chu
- Lucia Pak Hui-sun
- Lucia Wang Cheng
- Lucia Yi Zhenmei
- Lucian of Antioch
- Lucian the Presbyter of the Kiev Caves
- Lucius of Chur
- Lucy
- Lucy Filippini
- Lucy Wang Wangzhi
- Ludger
- Ludmila of Bohemia
- Ludolf of Ratzeburg
- Ludovico of Casoria
- Luigi Guanella
- Luigi Maria Palazzolo
- Luigi Orione
- Luigi Scrosoppi
- Luigi Versiglia
- Luis Batis Sáinz
- Luke
- Luke Alonso Gorda
- Luke Hwang Sok-tu
- Luke Kirby
- Luke Phạm Trọng Thìn
- Luke Vũ Bá Loan
- Luke of Armento
- Luke of Steiris
- Luke the Steward of the Kiev Caves
- Lukka Baanabakintu
- Lupus of Lyon
- Lupus of Sens
- Lupus of Troyes
- Lutgardis
- Luxorius
- Lydia of Thyatira
- Léon-Ignace Mangin
- Léonie Aviat
- Macarius of Alexandria
- Macarius of Corinth
- Macarius of Pelekete
- Macarius the Deacon of the Kiev Far Caves
- Macarius the Faster of the Kiev Near Caves
- Macarius the Great
- Macrina the Younger
- Madeleine Sophie Barat
- Magdalena Cho
- Magdalena Han Yong-i
- Magdalena Ho Kye-im
- Magdalena Kim Ob-i
- Magdalena Pak Pong-son
- Magdalena Son So-byog
- Magdalena Yi Yong-dog
- Magdalena Yi Yong-hui
- Magdalena of Mălainița
- Magdalene Du Fengju
- Magdalene of Canossa
- Magdalene of Nagasaki
- Magneric of Trier
- Magnus Erlendsson
- Magnus of Anagni
- Majolus of Cluny
- Malachi
- Malchus of Syria
- Mansuetus of Milan
- Manuel González García
- Manuel Morales
- Manuel Míguez González
- Manuel Rodrigues de Moura
- Manuel Ruiz López
- Marcella of Rome
- Marcellin Champagnat
- Marcellinus of Rome
- Marcellinus of Tomi
- Marcellus of Capua
- Marcellus the Acoemete
- Marcellus, Bishop of Apamea
- Marcian of Tortona
- Marciana of Mauretania
- Marciano José
- Margaret Clitherow
- Margaret Mary Alacoque
- Margaret Ward
- Margaret of Antioch
- Margaret of Castello
- Margaret of Cortona
- Margaret of Hungary
- Margaret of Scotland
- Margarito Flores García
- Marguerite Bays
- Marguerite Bourgeoys
- Maria Bernarda Bütler
- Maria Bertilla Boscardin
- Maria Brâncoveanu
- Maria Crescentia Höss
- Maria Cristina of the Immaculate Conception Brando
- Maria Crocifissa Di Rosa
- Maria Domenica Mantovani
- Maria Domenica Mazzarello
- Maria Fan Kun
- Maria Francesca di Gesù
- Maria Giuseppa Rossello
- Maria Goretti
- Maria Katharina Kasper
- Maria Pak Kun-a-gi
- Maria Won Kwi-im
- Maria Yi In-dog
- Maria Yi Yon-hui
- Maria Zhao
- Maria Zheng Xu
- Maria de Mattias
- Mariam Baouardy
- Mariam Thresia Chiramel
- Mariana de Jesús de Paredes
- Marianna Giuliani
- Marianne Cope
- Marie Alphonsine Danil Ghattas
- Marie Marguerite d’Youville
- Marie Rivier
- Marie of Saint Just
- Marie of Saint Natalie
- Marie of the Incarnation
- Marie-Adolphine
- Marie-Azélie Guérin
- Marie-Eugénie de Jésus
- Marie-Hermine Grivot
- Marie-Léonie Paradis
- Marie-Madeleine Postel
- Marina of Ōmura
- Marinus
- Marius
- Mark
- Mark Chong Ui-bae
- Mark Ji Tianxiang
- Marko Krizin
- Marolus
- Maron
- Martha Kim Song-im
- Martha Wang Luo Mande
- Martha of Bethany
- Martha of Persia
- Martin Luc Huin
- Martin Thọ
- Martin Tạ Đức Thịnh
- Martin Wu Xuesheng
- Martin de Porres
- Martin of León
- Martin of Tours
- Martin of the Ascension
- Martina of Rome
- Martinian
- Martinian of Caesarea
- Martyrius the Deacon of the Kiev Caves
- Marus of Trier
- Maruthas of Martyropolis
- Mary
- Mary An Guoshi
- Mary An Linghua
- Mary Du Tianshi
- Mary Du Zhaozhi
- Mary Euphrasia Pelletier
- Mary Frances of the Five Wounds
- Mary Fu Guilin
- Mary Guo Li
- Mary MacKillop
- Mary Magdalene
- Mary Magdalene de' Pazzi
- Mary Qi Yu
- Mary Wang Lishi
- Mary Zhao Guoshi
- Mary Zhu Wushi
- Mary of Bethany
- María Antonia de Paz y Figueroa
- María Guadalupe García Zavala
- María Josefa Sancho de Guerra
- María Micaela Desmaisières
- María Natividad Venegas de la Torre
- María Rosa Molas
- María Soledad Torres y Acosta
- María de la Purísima Salvat Romero
- María de las Maravillas de Jesús
- Mateo Alonso de Leciniana
- Mateo Correa Magallanes
- Maternus of Cologne
- Mateus Moreira
- Matilda of Ringelheim
- Matiya Mulumba
- Matrona of Hurezi
- Matthew
- Matthew Kohioye
- Matthew Lê Văn Gẫm
- Matthew Nguyễn Văn Phượng
- Matthew the Clairvoyant of the Kiev Caves
- Matthias Feng De
- Matthias of Jerusalem
- Matthias of Miyako
- Matthias the Apostle
- Maura of Constantinople
- Maura of Ravenna
- Maurice of Agaunum
- Maurice of Carnoët
- Mauront of Douai
- Maurus
- Mavra of Ceahlău
- Maxellende of Caudry
- Maximian of Ravenna
- Maximilian Kolbe
- Maximinus of Trier
- Maximos of Kapsokalyvia
- Maximus of Naples
- Maximus of Rome
- Maximus of Évreux
- Maximus the Confessor
- Mbaga Tuzinde
- Mechtilde of Hackeborn
- Meinhard
- Meinrad of Einsiedeln
- Melaine of Rennes
- Melangell
- Melania the Younger
- Melchior Grodziecki
- Melchizedek
- Melchor García Sampedro
- Meletius of Antioch
- Melito of Sardis
- Mellitus of Canterbury
- Memmius of Châlons
- Menas
- Menodora
- Mercurialis of Forlì
- Meriadoc of Vannes
- Methodios I of Constantinople
- Methodius of Olympus
- Methodius of Thessalonica
- Metrodora
- Mewan of Gaël
- Micah
- Michael Hồ Đình Hy
- Michael Kozaki
- Michael Kurobioye
- Michael Nguyễn Huy Mỹ
- Michael de Sanctis
- Michael of Synnada
- Michael the Archangel
- Michael the Synkellos
- Michel Garicoïts
- Miguel Febres Cordero
- Miguel de Aozaraza
- Miguel de Añon
- Miguel de la Mora
- Mildrith of Minster
- Miletus of Trier
- Milon of Fontenelle
- Mirocles
- Mo Chutu of Lismore
- Modesta of Oeren
- Modeste Andlauer
- Modestus of Trier
- Modoald of Trier
- Monica of Hippo
- Moninne of Killeavy
- Monitor of Orléans
- Monulphus of Maastricht
- Moses
- Moses the Black
- Moses the Wonderworker of the Kiev Caves
- Mugagga Lubowa
- Mukasa Kiriwawanvu
- Munditia
- Mungo
- Mura of Fahan
- Muredach of Killala
- Mutien-Marie Wiaux
- Myron of Crete
- Máedóc of Ferns
- Máel Ruba
- Ménehould of Perthes
- Nabor of Milan
- Nahum
- Namatius of Clermont
- Namatius of Vienne
- Narcisa de Jesús
- Narcissus
- Narnus
- Natalia of Córdoba
- Natalis of Kinawley
- Naukratios of Studion
- Naum of Ohrid
- Nazaria Ignacia March Mesa
- Nazaria of Văratec
- Nazarius
- Nectan of Hartland
- Nectarius of Auvergne
- Nectarius the Obedient of the Kiev Caves
- Nereus
- Nerses IV the Gracious
- Nerses the Great
- Nicanor Ascanio Soria
- Nicanor the Deacon
- Nicasius of Die
- Nicasius of Heeze
- Nicasius of Reims
- Nicephorus of Medikion
- Nicephorus the Leper
- Nicetas Stethatos
- Nicetas of Medikion
- Nicetas of Remesiana
- Nicetas the Goth
- Nicetas the Patrician
- Nicetius of Lyon
- Nicetius of Trier
- Nicholas Bùi Đức Thể
- Nicholas Owen
- Nicholas Pieck
- Nicholas Poppel
- Nicholas Tavelic
- Nicholas of Flüe
- Nicholas of Myra
- Nicholas of Tolentino
- Nicholas the Pilgrim
- Nicholas the Studite
- Nicodemus
- Nicodemus of Kellarana
- Nicodemus the Hagiorite
- Nicodemus the Prosphora Baker
- Nicola Saggio
- Nicolás Alberca
- Nicomedes
- Nidan of Anglesey
- Nikanor of Zavorda
- Nikephoros of Chios
- Nikodemos of Beroia
- Nilus of Palestine
- Nilus of Sinai
- Nimatullah Kassab
- Ninian
- Nino
- Nivard of Reims
- Noah
- Nonna of Nazianzus
- Norbert of Xanten
- Nothhelm
- Novatus
- Nowa Mawaggali
- Noël Chabanel
- Numerian of Trier
- Nuno Álvares Pereira
- Nunzio Sulprizio
- Nympha
- Nymphodora
- Obadiah
- Oda of Sint-Oedenrode
- Odile of Alsace
- Odilia of Cologne
- Odilo of Cluny
- Odo of Cluny
- Olaf II Haraldsson
- Olga of Kiev
- Oliva of Brescia
- Oliver Plunkett
- Olympias of Fărcașa
- Olympias of Văratec
- Onesimus
- Onesimus the Recluse of the Kiev Caves
- Onesiphorus
- Onuphrius
- Onuphrius the Silent of the Kiev Caves
- Optatus of Milevis
- Oran of Iona
- Orentius
- Orientius
- Oscar Romero
- Osmund
- Oswald of Northumbria
- Oswald of Worcester
- Othmar
- Otto of Bamberg
- Ovidius of Braga
- Pachomius
- Pachomius the Great
- Pacian
- Pacificus of San Severino
- Paisios of Mount Athos
- Paisius of the Kiev Caves
- Palatias
- Palladius the Desert Dweller
- Pambo of Nitria
- Pambo the Recluse of the Kiev Caves
- Pamphilus of Caesarea
- Pancras of Rome
- Pancras of Taormina
- Pancratius of the Kiev Caves
- Pantaenus
- Pantagathus of Vienne
- Pantaleon
- Paola Elisabetta Cerioli
- Paphnutius of Thebes
- Paphnutius the Recluse of the Kiev Caves
- Papias of Hierapolis
- Pardulf of Guéret
- Parmenas
- Parthenius of Lampsacus
- Parthenius of Rome
- Paschal Baylon
- Paschasius Radbertus
- Paternus of Auch
- Paternus of Avranches
- Patiens of Lyon
- Patiens of Metz
- Patrick Dong Bodi
- Patrick of Ireland
- Paul
- Paul Chen Changpin
- Paul Chong Ha-sang
- Paul Denn
- Paul Ge Tingzhu
- Paul Ho Hyob
- Paul Hong Yong-ju
- Paul Hạnh
- Paul Ibaraki
- Paul Liu Hanzuo
- Paul Liu Jinde
- Paul Lê Bảo Tịnh
- Paul Lê Văn Lộc
- Paul Miki
- Paul Nguyen Van My
- Paul Nguyễn Ngân
- Paul Phạm Khắc Khoan
- Paul Suzuki
- Paul Tong Viet Buong
- Paul VI
- Paul Vũ Văn Đổng
- Paul Wu Anju
- Paul of Thebes
- Paul of the Cross
- Paul the Obedient of the Kiev Caves
- Paul the Simple
- Paula Frassinetti
- Paula Montal Fornés
- Paula of Rome
- Pauline of the Agonizing Heart of Jesus
- Paulinus II of Aquileia
- Paulinus of Lucca
- Paulinus of Nola
- Paulinus of Trier
- Paulus Lang Fu
- Paulus Wu Wanshu
- Pausilippus
- Pedro Almato
- Pedro Arbués
- Pedro Armengol
- Pedro Calungsod
- Pedro Esqueda Ramirez
- Pedro Nolasco Soler Méndez
- Pedro Poveda Castroverde
- Pedro de Corpa
- Pega
- Pelagia of Tarsus
- Peleus
- Peregrine Laziosi
- Peregrine of Auxerre
- Perpetua
- Perpetua Hong Kum-ju
- Perpetuus of Tours
- Perpète of Dinant
- Peter
- Peter Balsam
- Peter Baptist
- Peter Canisius
- Peter Chanel
- Peter Cho Hwa-so
- Peter Choe Chang-hub
- Peter Choe Hyong
- Peter Chong Won-ji
- Peter Chrysologus
- Peter Claver
- Peter Damian
- Peter Dũng
- Peter Faber
- Peter Fourier
- Peter Hong Pyong-ju
- Peter Julian Eymard
- Peter Khan
- Peter Kwon Tug-in
- Peter Li Quanhui
- Peter Liu
- Peter Liu Ziyu
- Peter Lê Tuỳ
- Peter Maubant
- Peter Nam Kyong-mun
- Peter Nguyen Dich
- Peter Nguyen Khac Tu
- Peter Nguyễn Bá Tuần
- Peter Nguyễn Văn Hiếu
- Peter Nguyễn Văn Lựu
- Peter Nguyễn Văn Tự
- Peter Nolasco
- Peter Phan Hữu Đa
- Peter Sanz
- Peter Son Son-ji
- Peter Sukejiro
- Peter Thomas
- Peter To Rot
- Peter Trương Văn Thi
- Peter Trương Văn Đường
- Peter Võ Đăng Khoa
- Peter Vũ Văn Truật
- Peter Wang Erman
- Peter Wang Zuolong
- Peter Wu Anbang
- Peter Wu Guosheng
- Peter Yi Ho-yong
- Peter Yi Myong-so
- Peter Yu Chong-nyul
- Peter Yu Tae-chol
- Peter Zhang Banniu
- Peter Zhao Mingzhen
- Peter de Regalado
- Peter of Alcantara
- Peter of Alexandria
- Peter of Anagni
- Peter of Assche
- Peter of Atroa
- Peter of Avranches
- Peter of Canterbury
- Peter of Galatia
- Peter of Jesus Maldonado
- Peter of Narbonne
- Peter of Nicaea
- Peter of Saint Joseph de Betancur
- Peter of Tarentaise
- Peter of Verona
- Peter the Aleut
- Peter the Exorcist
- Peter Ðoàn Văn Vân
- Peter Đinh Văn Thuần
- Peter Đoàn Công Quý
- Petroc of Cornwall
- Petronax of Monte Cassino
- Petronilla
- Petronius of Bologna
- Petrus Zhu Rixin
- Pharnacius of Satala
- Philaret of Seminara
- Philemon
- Philetus
- Philibert of Jumièges
- Philip
- Philip Benizi
- Philip Evans
- Philip Howard
- Philip Neri
- Philip Phan Văn Minh
- Philip Zhang Zhihe
- Philip of Gortyna
- Philip of Jesus
- Philo
- Philomena
- Philothea of Pasărea
- Philotheos Kokkinos
- Philotheus of Mount Athos
- Phocas
- Phocas the Gardener
- Photius of Constantinople
- Pier Giorgio Frassati
- Pierina Morosini
- Pierre Aumaître
- Pierre Dumoulin-Borie
- Pierre-François Néron
- Pietro I Orseolo
- Pimen of Palestine
- Pimen the Faster of the Kiev Far Caves
- Pimen the Faster of the Kiev Near Caves
- Pinytus
- Pio of Pietrelcina
- Pirmin
- Pius I
- Pius X
- Placidus of Messina
- Plato of Sakkudion
- Platonida of Argeș
- Plautilla
- Plechelm
- Podius of Florence
- Polycarp of Smyrna
- Polydore Plasden
- Pompilio Maria Pirrotti
- Ponsiano Ngondwe
- Pontian
- Pontianus of Spoleto
- Pope Adeodatus I
- Pope Adrian III
- Pope Agapetus I
- Pope Agatho
- Pope Alexander I of Rome
- Pope Anastasius I
- Pope Anicetus
- Pope Anterus
- Pope Benedict II
- Pope Boniface I
- Pope Boniface IV
- Pope Caius
- Pope Celestine I
- Pope Celestine V
- Pope Cornelius
- Pope Eleutherius
- Pope Eugene I
- Pope Eusebius
- Pope Eutychian
- Pope Felix I
- Pope Felix III
- Pope Felix IV
- Pope Gregory II
- Pope Gregory III
- Pope Gregory VII
- Pope Hilarius
- Pope Hormisdas
- Pope Innocent I
- Pope John I
- Pope Julius I
- Pope Leo II
- Pope Leo III
- Pope Leo IV
- Pope Leo IX
- Pope Lucius I
- Pope Marcellus I
- Pope Martin I
- Pope Miltiades
- Pope Nicholas I
- Pope Paschal I
- Pope Paul I
- Pope Pius V
- Pope Sergius I
- Pope Simplicius
- Pope Siricius
- Pope Sixtus I
- Pope Sixtus III
- Pope Soter
- Pope Stephen I
- Pope Sylvester I
- Pope Telesphorus
- Pope Urban I
- Pope Vitalian
- Pope Zephyrinus
- Pope Zosimus
- Poppo of Stavelot
- Porphyrios of Kavsokalyvia
- Possidius of Calama
- Potentian
- Pothinus
- Praejectus
- Praxedes
- Primus
- Prisca
- Priscus of Auxerre
- Privatus of Mende
- Probianus of Bourges
- Probus
- Processus
- Procopius of Decapolis
- Procopius of Sázava
- Proculus of Bologna
- Proculus of Pozzuoli
- Protasius Chong Kuk-bo
- Protus
- Ptolemaeus
- Publius
- Pusai
- Quadratus of Africa
- Quadratus of Athens
- Quentin of Amiens
- Quirinus of Neuss
- Quirinus of Sescia
- Rabanus Maurus
- Rafael Arnáiz Barón
- Rafael Guízar y Valencia
- Rafaela Porras y Ayllón
- Rafqa Pietra Choboq Ar-Rayès
- Rainerius
- Ralph Sherwin
- Raphael Kalinowski
- Raphael Massabki
- Raphael of Brooklyn
- Raphael the Archangel
- Raymond Li Quanzhen
- Raymond Nonnatus
- Raymond of Peñafort
- Raynerius of Split
- Regina of Alise
- Regnobert of Bayeux
- Reineldis of Saintes
- Relindis of Maaseik
- Remaclus of Stavelot
- Remigius of Reims
- Renfroie of Denain
- René Goupil
- Reolus of Reims
- Restituta of Sora
- Richard Gwyn
- Richard Pampuri
- Richard Reynolds
- Richard of Chichester
- Richard the Pilgrim
- Rictrude of Marchiennes
- Rigobert of Reims
- Rigomer of Maine
- Rita of Cascia
- Robert Bellarmine
- Robert Lawrence
- Robert Southwell
- Robert of Knaresborough
- Robert of Molesme
- Robert of Newminster
- Roderick of Córdoba
- Rodrigo Aguilar Alemán
- Romanos of Karpenisi
- Romanus Ostiarius
- Romanus of Caesarea
- Romanus of Kirzhach
- Romanus of Uglich
- Romaric
- Romuald of Ravenna
- Romulus
- Romylos of Vidin
- Román Adame Rosales
- Roque González de Santa Cruz
- Rosa Kim
- Rosa Venerini
- Rose Chen Aijie
- Rose Fan Hui
- Rose Philippine Duchesne
- Rose Zhao
- Rose of Lima
- Rose of Viterbo
- Rudesind
- Rufina
- Rufinus of Assisi
- Rufus of Metz
- Rufus the Obedient of the Kiev Caves
- Rumbold of Mechelen
- Rupert of Bingen
- Rupert of Salzburg
- Ruricius I of Limoges
- Ruricius II of Limoges
- Rusticula of Arles
- Rusticus of Cahors
- Rusticus of Lyon
- Rusticus of Narbonne
- Ruth
- Rémy Isoré
- Rögnvald Kali Kolsson
- Sabas of Collesano
- Sabas of Vatopedi
- Sabaudus of Trier
- Sabbas the Goth
- Sabbas the Sanctified
- Sabbatius of Solovki
- Sabinus of Canosa
- Sabinus of Spoleto
- Sabás Reyes Salazar
- Sacerdos of Lyon
- Sagar of Laodicea
- Salaberga of Laon
- Salonius
- Salvador Lara Puente
- Salvador of Horta
- Salvian of Marseille
- Samson
- Samuel
- Sarah
- Saturnina of Sirit
- Saturninus of Cagliari
- Saturninus of Toulouse
- Satyrus of Milan
- Sava II of Serbia
- Sava of Serbia
- Savina of Milan
- Savinian of Sens
- Savva of Ioannina
- Savva of Storozhev
- Savva of Vishera
- Savva the Recluse of the Kiev Caves
- Savvas of Kalymnos
- Scholastica
- Scillitan Martyrs
- Sebaldus
- Sebastian Nam I-gwan
- Sebastian of Rome
- Secunda
- Secundus of Asti
- Seiriol of Penmon
- Senan
- Senator of Milan
- Sennen
- Septimius of Iesi
- Seraphim of Sarov
- Seraphin of Montegranaro
- Serapia
- Serapion of Algiers
- Serapion of Novgorod
- Serapion of Thmuis
- Serenus the Gardener
- Sergius of Caesarea
- Sergius of Malopinega
- Sergius of Valaam
- Seridos of Gaza
- Servandus
- Servatius of Tongeren
- Severian of Scythopolis
- Severinus of Noricum
- Severus of Avranches
- Severus of Barcelona
- Severus of Naples
- Severus of Ravenna
- Shemon Bar Sabbae
- Shio of Mgvime
- Siard of Mariëngaarde
- Sidonius Apollinaris
- Sigebert III of Austrasia
- Sigfrid of Växjö
- Sigismund of Burgundy
- Silas
- Silouan the Athonite
- Silvanus of Gaza
- Silvanus the Schemamonk of the Kiev Caves
- Silverius
- Silvia
- Silvin of Auchy
- Simeon Berneux
- Simeon Stylites
- Simeon of Jerusalem
- Simeon of Polirone
- Simeon of Polotsk and Tver
- Simon Phan Đắc Hoà
- Simon Qin Chunfu
- Simon Stock
- Simon the Zealot
- Simpert
- Simplicius of Bourges
- Simón de Rojas
- Sindulf of Reims
- Sisenandus of Beja
- Sisoes the Schemamonk of the Kiev Caves
- Sixtus II
- Smaragdus of Rome
- Solomon
- Solomon Leclercq
- Solomonia
- Solus of Solnhofen
- Sophronius the Bulgarian
- Sophronius the Recluse of the Kiev Caves
- Sophrony of Essex
- Sossius of Misenum
- Sosthenes of Corinth
- Spyridon
- Stachys the Apostle
- Stanislaus Kostka
- Stanislaus Papczyński
- Stanislaus of Szczepanów
- Stanisław Kazimierczyk
- Stephen Harding
- Stephen I of Hungary
- Stephen Min Kuk-ka
- Stephen Nguyễn Văn Vinh
- Stephen Pongrácz
- Stephen of Cuneo
- Stephen of Jerusalem
- Stephen of Muret
- Stephen of Obazine
- Stephen of Perm
- Stephen the Younger
- Sturm
- Suitbert of Kaiserswerth
- Sulpicius I of Bourges
- Sulpicius the Pious
- Susanna
- Susanna U Sur-im
- Swithun Wells
- Swithun of Winchester
- Syagrius of Autun
- Sylvester Gozzolini
- Sylvester of Obnora
- Symeon of Trier
- Symeon the New Theologian
- Symmachus
- Symphorian of Autun
- Symphorosa
- Szymon of Lipnica
- Talarican
- Tarachus
- Tarcisius
- Tatian the Syrian
- Tatwine of Canterbury
- Taurinus
- Teacher Eleazar
- Teilo of Llandaff
- Telemachus
- Terentian
- Teresa Chen Jinjie
- Teresa Jornet Ibars
- Teresa Margaret of the Sacred Heart
- Teresa Zhang Heshi
- Teresa of Calcutta
- Teresa of the Andes
- Teresa of Ávila
- Tertullian
- Tetrade of Bourges
- Tetric of Auxerre
- Thaddeus
- Thaddeus Liu
- Thamel
- The Holy Innocents
- Thecla
- Thecla of Iconium
- Thecla of Kitzingen
- Theobald of Marly
- Theobald of Provins
- Theodard of Maastricht
- Theodora
- Theodora of Alexandria
- Theodora of Sihla
- Theodora of Thessalonica
- Theodore Graptos
- Theodore I
- Theodore Stratelates
- Theodore Trichinas
- Theodore Ushakov
- Theodore of Edessa
- Theodore of Pavia
- Theodore the Silent of the Kiev Caves
- Theodore the Studite
- Theodore van der Eem
- Theodore, first Bishop of Rostov
- Theodoret of Antioch
- Theodoric Balat
- Theodosia of Constantinople
- Theodosia of Tyre
- Theodosius of Chernihiv
- Theodosius of Kyiv
- Theodosius of Tarnovo
- Theodotus of Ancyra
- Theodulf of Saint-Thierry
- Theoleptos of Philadelphia
- Theonas
- Theophanes Graptos
- Theophanes the Confessor
- Theophanes the Faster of the Kiev Caves
- Theophilos the Myrrh-Bearer
- Theophilus of Antioch
- Theophilus of Corte
- Theophylact of Nicomedia
- Theopista
- Theotonius of Coimbra
- Theresa Kim
- Theresa Kim Im-i
- Theresa Yi Mae-im
- Thomas
- Thomas Aquinas
- Thomas Becket
- Thomas Garnet
- Thomas Hioji Nishi
- Thomas I of Constantinople
- Thomas Khuong
- Thomas Kozaki
- Thomas More
- Thomas Nguyễn Văn Đệ
- Thomas Shen Jihe
- Thomas Son Cha-son
- Thomas Toán
- Thomas Trần Văn Thiện
- Thomas Xico
- Thomas de Cantilupe
- Thomas of Bithynia
- Thomas of Mount Maleos
- Thomas of Villanova
- Thomas Đinh Viết Dụ
- Thraseas
- Thuriau of Dol
- Thyrsus of Bithynia
- Théodore Guérin
- Théophane Vénard
- Thérèse Couderc
- Thérèse of Lisieux
- Tikhon of Amathus
- Tikhon of Kaluga
- Tikhon of Lukh
- Tikhon of Moscow
- Tillo of Solignac
- Timothy
- Titus
- Titus Brandsma
- Titus of Bostra
- Titus the Soldier of the Kiev Caves
- Tobit
- Tola of Clonard
- Tommaso da Cori
- Toribio Romo
- Torpes of Pisa
- Tranquilino Ubiarco Robles
- Tressan of Mareuil
- Trudo of Sint-Truiden
- Tryphon
- Tryphon of Constantinople
- Tryphon of Rostov
- Tuda of Northumbria
- Tugdual of Tréguier
- Turibius of Mogrovejo
- Ubald
- Ubaldesca Taccini
- Ulrich of Augsburg
- Urban of Langres
- Ursicinus of Cahors
- Ursicinus of Ravenna
- Ursinus of Bourges
- Ursmar
- Ursula
- Ursula Ledóchowska
- Ursus of Auxerre
- Valentine of Rome
- Valentín de Berriochoa
- Valerius of Bierzo
- Vanne of Verdun
- Venantius Fortunatus
- Venantius of Camerino
- Vendemianus of Bithynia
- Venerius of Milan
- Venerius of Tino
- Veranus of Cavaillon
- Verdiana
- Verena of Zurzach
- Veronica
- Veronica Giuliani
- Viator of Bergamo
- Vicenta María López y Vicuña
- Vicente Liem de la Paz
- Victor I
- Victor of Capua
- Victoria
- Victoria of Albitina
- Victorinus of Pettau
- Victricius of Rouen
- Vigilius of Trent
- Vigor of Bayeux
- Viktor of Xanten
- Villicus of Metz
- Vincent Dương
- Vincent Ferrer
- Vincent Nguyễn Thế Điểm
- Vincent Shiwozuka
- Vincent Strambi
- Vincent Tường
- Vincent de Paul
- Vincent of Lérins
- Vincent of Saragossa
- Vincent Đỗ Yến
- Vincenza Gerosa
- Vincenzo Grossi
- Vincenzo Pallotti
- Vincenzo Romano
- Virgil of Salzburg
- Virginia Centurione Bracelli
- Vitalis of Castronovo
- Vitalis of Savigny
- Vitus
- Viventiolus of Lyon
- Vladimir the Great
- Walaric of Leuconay
- Walpurga of Heidenheim
- Walter of Pontoise
- Waltheof of Melrose
- Wandrille of Fontenelle
- Wasnon of Condé
- Wenceslaus
- Wendelin of Trier
- Weomad of Trier
- Werburgh of Chester
- Wiborada
- Wigbert of Fritzlar
- Wihtburh of Dereham
- Wilfrid
- Wilfrid II
- Wilgils
- Willehad
- Willehad of Denmark
- William Pinchon
- William of Bourges
- William of Gellone
- William of Maleval
- William of Perth
- William of Roskilde
- William of York
- William of Æbelholt
- Willibald
- Willibrord
- Winifred of Holywell
- Winnoc of Wormhout
- Winwaloe of Landévennec
- Wivina of Grand-Bigard
- Wolfgang of Regensburg
- Wulfram of Sens
- Wulfstan of Worcester
- Wulmar of Samer
- Wulphy of Rue
- Xenophon of Robeika
- Yangzhi Lang
- Zacchaeus of Jerusalem
- Zachariah the Faster of the Kiev Caves
- Zacharias of Vienne
- Zachary
- Zanitas of Bardiaboch
- Zdislava Berka
- Zeno of Verona
- Zeno the Faster of the Kiev Caves
- Zenobius of Florence
- Zephaniah
- Zhang Huailu
- Zita
- Zoilus
- Zosimus of Syracuse
- Zygmunt Gorazdowski
- Zygmunt Szczęsny Feliński
- Áurea of San Millán
- Ælfheah of Canterbury
- Ælfwold II of Sherborne
- Éman of Chartres
- Émilie de Rodat
- Émilie de Vialar
- Émilie de Villeneuve
- Íñigo of Oña