- Jablonska, Bernardina Maria
- Jaccard, Francis
- Jacinta Marto
- Jacob Cusmano
- Jacob Desiré Laval
- Jacob Gapp
- Jacob Libermann
- Jacob of Nisibis
- Jacoba
- Jacobi Major
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- Jacobinus de Canepaci
- Jacobis, Justin de
- Jacobus de Blanconibus de Mevania
- Jacobus de Voragine
- Jacomo da Todi
- Jacopino of Canepaci
- Jacopo Benedetti
- Jacopo Benedicti
- Jacopo Gangala
- Jacopo Guidi
- Jacopo de Voragine
- Jacopone da Todi
- Jacopone of Todi
- Jacques Fermin
- Jacques Laval
- Jacques Ledoyen
- Jacut
- Jacynthe
- Jader
- Jadwiga
- Jägerstätter, Franz
- Jaime Hilario
- Jaime Hilario Barbel
- Jakob Buzabaliawo
- Jakob Gapp
- Jakob Hilarius
- Jakym Senkivskyj
- Jambert
- James
- James Andrade
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- James Bell
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- James Bertoni
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- James Denxi
- James Duckett
- James Fayashida
- James Fayaxida
- James Fenn
- James Gangala
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- James Grissinger
- James Guengoro
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- James Hudson
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- James Kisai
- James Kizayemon
- James Lacop
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- James Salomone
- James Salomonelli
- James Salomonius
- James Thompson
- James Voragine
- James Walworth
- James da Todi
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- James the Almsgiver
- James the Deacon
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- James the Palestinian
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- James the Younger
- James, Edward
- James, Roger
- Jan Beyzym
- Jan Nepomuk Chrzan
- Jan Sarkander
- Jan van Ruusbroec
- Jana Papczynski
- Jane Antide Thouret
- Jane Delanoue
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- Jane Frances de Chantal
- Jane Gerard
- Jane Jugan
- Jane Louise Barré
- Jane Marie de Maille
- Jane Mary Bonomo
- Jane Mary de Maille
- Jane Reiné Prin
- Jane Scopelli
- Jane Soderini
- Jane de Lestonnac
- Jane of Bagno
- Jane of Cáceres
- Jane of Orvieto
- Jane of Portugal
- Jane of Reggio
- Jane of Segna
- Jane of Toulouse
- Jane of Valois
- Janssen, Arnold
- Januarius 7 Jan
- Januarius 19 Jan
- Januarius 8 Apr
- Januarius 29 Apr
- Januarius 10 Jul
- Januarius 11 Jul
- Januarius 15 Jul
- Januarius 7 Aug
- Januarius 19 Sep
- Jara, Cristobal Magallanes
- Jared
- Jaricot, Pauline
- Jarlath 1 Feb
- Jarlath 6 Jun
- Jarman
- Jarrige, Catherine
- Jason 12 July
- Jason 3 Dec
- Javouhey, Anne Mary
- Javron, Constantian of
- Jean d' Arc
- Jean-Baptiste Lego
- Jean Francis Regis
- Jean Francois Regis
- Jean Lalande
- Jean-Marie Muzeeyi
- Jean-Martin Moÿe
- Jean Ménard
- Jean Regis
- Jean-Théophane Vénard
- Jeanne Antide Thouret
- Jeanne Delanoue
- Jeanne Elizabeth des Bichier des Anges
- Jeanne Frances de Chantal
- Jeanne Gerard
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- Jeanne Jugan
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- Jeffrey of Amiens
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- Jehanne Darc
- Jenaro Sánchez Delgadillo
- Jennings, Edmund
- Jered
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- Jeremias 16 Feb
- Jeremias 15 Sep
- Jeremy 16 Feb
- Jeremy 15 Sep
- Jermyn Gardiner
- Jerobaal
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- Jerome de Angelis
- Jerome de Torres
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- Jerome Emiliani
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- Jerome Lou-Tin-Mei
- Jerome Lu
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- Jerome of Werden
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- Jerome Ranuzzi
- Jerónimo Hermosilla
- Jerubebbeth
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- Jerusalem, Alexander of
- Jerusalem, Andrew of
- Jerusalem, Angelus of
- Jerusalem, Athanasius of
- Jerusalem, Cyril of
- Jerusalem, Macarius of
- Jerzy Matulevicz
- Jestin
- Jesuit Martyrs of North America
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- Jesus, Brigida of
- Jesus, Felipe de
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- Jesus, Mariana of
- Jesus, Philip of
- Jeuris, Pauline
- Jésus, Marie Eugénie de
- Jildo Irwa
- Joachim
- Joachim de Floris
- Joachim Firaiama-Diz
- Joachim Firayama-Diz
- Joachim Ho
- Joachim of Fiore
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- Joachim Perez
- Joachim Piccolomini
- Joachim Royo
- Joachim Royo Perez
- Joachim Saccachibara
- Joachim Sakachibara
- Joachim of Saint Anne
- Joachim the Prophet
- Joachim von Fiore
- Joachina de Vedruna
- Joakim Hao Kaizhi
- Joan Antide Thouret
- Joan Delanoue
- Joan Frances de Chantal
- Joan Gerard
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- Joan Mary Bonomo
- Joan Mary de Maille
- Joan Reiné Prin
- Joan Scopelli
- Joan Soderini
- Joan of Arc
- Joan of Aza
- Joan of Bagno
- Joan of Cáceres
- Joan of France
- Joan de Lestonnac
- Joan of Orvieto
- Joan of Portugal
- Joan of Reggio
- Joan of Segna
- Joan of Toulouse
- Joan of Valois
- Joana Antide Thouret
- Joana Frances de Chantal
- Joana Gerard
- Joana Louise Barré
- Joana Maria Bonomo
- Joana Maria de Maille
- Joana Reiné Prin
- Joana Scopelli
- Joana Soderini
- Joana de Bagno
- Joana de Cáceres
- Joana de Orvieto
- Joana de Portugal
- Joana de Reggio
- Joana de Segna
- Joana de Toulouse
- Joana de Valois
- Joanna the Myrhhbearer
- Joanna
- Joanna Maria Condesa Lluch
- Joannes Eleemosynarius
- Joannes Misericors
- Joannicus de San Juan
- Joannicus of Mount Olympus
- Joannicus of Olympus
- Joannicus of Saint John
- Joannicus
- Joanninus de San Juan
- Joanninus of Saint John
- Joaquima Vedruna de Mas
- Joaquina Vedruna de Mas
- Joasaph
- Joavan
- Job
- Job of Tuscany
- Jocelin
- Jodoc
- Jodocus
- Jodokus
- Joel
- Joel
- Johann Nepomuk von Tschiderer
- Johanna Antide Thouret
- Johanna Delanoue
- Johanna Frances de Chantal
- Johanna Gerard
- Johanna Louise Barré
- Johanna Mary Bonomo
- Johanna Mary de Maille
- Johanna Reiné Prin
- Johanna Scopelli
- Johanna Soderini
- Johanna de Bagno
- Johanna de Cáceres
- Johanna de Orvieto
- Johanna de Portugal
- Johanna de Reggio
- Johanna de Segna
- Johanna de Toulouse
- Johanna de Valois
- Johannes Antonius Farina
- Johannes Sarkander
- John 17 Jan
- John 31 Jan
- John 23 Jun
- John 26 Jun
- John 21 Jul
- John 18 Aug
- John 27 Aug
- John 1 Nov
- John 21 Dec
- John Adalbert Balicki
- John Adams
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- John Alcober Figuero
- John Almond
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- John Amias
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- John Angeloptes
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- John Baptist Lo
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- John Boste
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- John Buralli
- John Buonagiunta Monetti
- John Buoni
- John Cacciafronte
- John Calabites
- John Calabytes
- John Calibita
- John Camillus
- John Camillus the Good
- John Cantius
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- John Carey
- John Cassian
- John Charles Cornay
- John Charles Marchioni
- John Chrystostom
- John Cini
- John Cini della Pace
- John Cirita
- John Climacus
- John Colobus
- John Colombini
- John Cornay
- John Cornelius
- John Cratz
- John Damascene
- John Dat
- John Davy
- John de la lande
- John Discalceat
- John Dominic
- John Dominici
- John Dominici de Banchini
- John Duckett
- John Duns Scotus
- John Dvorák
- John Eudes
- John Eustace
- John Eynon
- John Felton
- John Fenwick
- John Fernandez
- John Fernandez
- John Figuero
- John Finch
- John Fisher
- John Foiamon
- John Forest
- John Foyamon
- John Francis Regis
- John Gabriel Perboyre
- John Garbella
- John Gaspard Cratz
- John Gavan
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