A
| Aaron (Aihran) of Aleth, Brittany, Hermit |
| Aaron of Caerleon, Wales, Romano-Briton Soldier, Martyr |
| Abban, Abbot of Magheranoidhe (aka Abban of New Ross), in Ireland |
| Abdon, Martyr |
| Abel, Archbishop of Rheims |
| Abilius, 3rd Patriarch of Alexandria |
| Abra, Daughter of St. Hilary, Bishop of Poitiers |
| Abraham of Smolensk, Abbot |
| Absalom of Cappadocia, Martyr |
| Abundantius |
| Abundinus, Martyr |
| Abundius, Bishop of Como |
| Abundius, Martyr |
| Abundius of Rome, sewer worker, Martyr |
| Acacius (Acathius) of Cappadocia, Soldier, Martyred in Byzantium |
| Acathius, Martyr |
| Acca, Abbot and Bishop of Hexham, Northumbria |
| Acepsimas, Bishop of Hnaita, Western Persia, Martyr |
| Acharius, Bishop of Noyon and Tournai, Belgium |
| Achilleus of Rome, Praetorian Guard, Martyr |
| Achius, Martyr |
| Acindynus of Thrace, Martyr |
| Acindynus, Persian Martyr |
| Acislo, Martyr of Cordoba |
| Adalar, Benedictine Companion of St. Boniface, Martyr |
| Adalbald of Ostrevant, Martyr |
| Adalbert (Voitech) Bishop of Prague and Martyr |
| Adalgisus of Thierache, Irish Missionary |
| Adam, Abbot of San Sabino Monastery in Fermo, Italy |
| Adela, Matron, Mother of St. Trond |
| Adelaide, Empress |
| Adelfa Soro de Nuestra Senora del Rosario, Dominican Nun, Martyr |
| Adelgunde (Aldegundis), Founding Abbess of Maubeuge |
| Adeltrudis, Countess of Aurillac, Mother of St. Gerald |
| Aderald of Troyes, Canon and Archdeacon |
| Adolph, bishop of Osnabruck |
| Adolph, Martyr |
| Adrian III, Pope |
| Adrian, Soldier and Martyr |
| Adriana of Frisia, Virgin and Martyr |
| Adulph, English Auxiliary Bishop of Maestricht |
| Aelred (Ethelred) Cistercian, Third Abbot of Rievaulx, Yorkshire, England |
| Aemiliana of Rome, Virgin, Aunt of Pope Gregory the Great |
| Aemilianus, Irish Abbot of Legny |
| Aemilius (Emilio) Martyr |
| Aengus the Culdee, Author of the Martyrology of Tallaght |
| Aetherius, Bishop of Vienne |
| Aetherius, Martyr |
| Afra, Virgin martyred at Augsburg |
| Agabus of Antioch, New Teatament Prophet |
| Agabus, Bishop of Novara |
| Agapit the Doctor (the Unmercenary), Monk of the Great Lavra of the Caves in Kiev |
| Agapitus of Caesarea, Martyr |
| Agapitus of Palestrina, Martyr |
| Agapitus of Rome, Pope |
| Agapitus, Bishop of Ravenna |
| Agapitus, Martyr |
| Agatha of Catania, Virgin and Martyr |
| Agathangelus, Martyr |
| Agatho, Pope |
| Agathon the Wonderworker, Monk of the Great Lavra of the Caves in Kiev |
| Agathonia, Martyr |
| Agathonica (Agathonice) of Pergamum, first woman Martyr named by Eusebius |
| Agathpodes, Deacon, Martyred in Thessaloniki |
| Agberto |
| Agilbert, Bishop of Angers |
| Agileus, Martyred at Carthage |
| Agilus (Ayeul), Abbot of Rebais (near Paris) |
| Agnellus of Naples, Abbot |
| Agnellus, Archbishop of Ravenna |
| Agnes of Bagno di Romagna, Camoldolese Nun |
| Agnes of Bohemia (Agnes of Prague), Princess and Poor Clare Abbess |
| Agnes of Jesus Galand, Dominican Prioress of Langeac, Mystic |
| Agnes of Montepulciano, Dominican Prioress |
| Agnes of Poitiers, St. Radegund’s adopted daughter, 1st Abbess of Holy Cross Convent |
| Agnes of Rome, Virgin and Martyr |
| Agoardus, Martyr |
| Agricola |
| Agricola, Bishop (either of Avignnon or Nevers) |
| Agricola, Martyr of Pannoia |
| Agrippina of Mineo, Sicily, Virgin and Martyr |
| Agrippina of Rome, Virgin and Martyr |
| Agrippinus, Bishop of Naples |
| Aibert, Benedictine Hermit |
| Aidan, Bishop of Lindisfarne |
| Ailbe, (Elvis) Irish Bishop of Emly |
| Airald, Bishop of st. Jean-de-Maurienne |
| Alain (Alan, Allen), Abbot of Lavaur in Gascony |
| Alain de Solminiihac, Augustinian Bishop of Cahors |
| Alaric of Ufnau, Swiss Priest and Hermit |
| Alban, Soldier, Protomartyr of England |
| Alberic Crescitelli, Italian Missionary, Martyred in China |
| Alberic, Co-founder of the Cistercian Order |
| Albert Avogadro, Patriarch of Jerusalem, Co-founder of the Carmelite Order |
| Albert of Bergamo, Married, third order Dominican, Confessor |
| Albert of Louvain, Cardinal Bishop of Liege, Martyr |
| Albert of Trapani, Carmelite Priest |
| Albert the Great, Dominican Bishop of Magdeburg and Doctor of the Church |
| Albert, Count of Haigerloch |
| Albertina Berkenbrock, Young Woman Martyred in Brazil |
| Alberto Marvelli, Head of Catholic Action in Italy |
| Albina of Formio, Virgin and Martyr |
| Albina of Paris, Martyr |
| Albinus (Albino), Bishop of Vercelli |
| Alburga, First Abbess of Wilton |
| Alcuin of York, Abbot of Tours, Head of Charlemagne’s School at Aachen |
| Alda (Aude), disciple of St. Genevieve, Hermit |
| Aldebrandus (Hildebrand) of Fossombrone, Abbot of Rimini |
| Aldegonde, Virgin, Abbess of Mons, Sister of Waldetrude |
| Aldegund (Adelgund), Foundress and First Abbess of Maubeuge, Hainault |
| Aldhelm, Abbot of Malmesbury, Bishop of Sherborne, England |
| Alena of Dielbeck, Brabant, Virgin and Martyr |
| Alethe de Montbard deFontaine, Mother of St. Bernard of Clairvaux |
| Alexander Akimetes (the Sleepless One) Founder of the Sleepless One monks |
| Alexander Carbonera, Bishop and Martyr |
| Alexander I, Pope and Martyr |
| Alexander Nevsky, Greatest Hero of Rus’ |
| Alexander of Carthage, Martyr |
| Alexander of Drizipara (Thrace), Soldier and Martyr |
| Alexander of Pydna, Macedonia, Soldier and Martyr |
| Alexander Sauli, Bishop, Apostle of Corsica |
| Alexander, Martyr |
| Alexander, Martyr |
| Alexander, Martyred at Antwerp |
| Alexander, Patriarch of Alexandria |
| Alexander, Patriarch of Constantinople |
| Alexandra of Egypt, Solitary |
| Alexis Falconieri, one of the Seven Holy Founders of the Servite Order |
| Alexis of Rome, Confessor |
| Alfons (Joseph) Maria Mazurek, Polish Carmelite Priest, Murdered by the Nazis |
| Alfonso (Alphonsus) Pacecho, Jesuit Priest, Martyred in India |
| Alfred Pampalon, Canadian Redemptorist Priest, patron of alcoholics and drug addicts |
| Alfred the Great, King of Wessex |
| Alfreda, Abbess of Crowland |
| Alice of Scherbeck, Cisterician Nun |
| Allaume of Burgos, French Soldier, Spanish Benedictine |
| Alodia of Huesca, Martyr of Cordoba |
| Aloysius (Luigi) Guanella, Priest, Founder of the Servants of Charity and the Daughters of St. Mary of Providence |
| Aloysius Gonzaga, Jesuit Novice |
| Alphaeus of Caesarea in Palsetine, Martyr |
| Alphonsa Muttathupadathu, Poor Clare Nun, first canonized Indian saint |
| Alphonsus (Alonzo) Rodriguez, Jesuit Lay Brother |
| Alphonsus Maria de Liguori, Bishop and Doctor of the Church, Founded the Redemptorists |
| Altfrid (Alfred), Bishop of Hildesheim |
| Altmann, Bishop of Passau |
| Alto |
| Alvaro of Cordoba, Dominican Prior |
| Alypius, Bishop of Tagaste in North Africa |
| Amadeus IX, Duke of Savoy |
| Amalia (Amalburga), Abbess of Rodin |
| Amand (Amandus), Bishop of Bordeaux |
| Amand (Amandus), Bishop of Maestricht, Apostle to Flanders |
| Amand (Amandus), Bishop of Rennes, Brittany |
| Amandus, Bishop of Worms |
| Amantia, Martyr |
| Amantius, Bishop of Como |
| Amasius, Bishop of Teano, Italy |
| Amata, Martyr |
| Amator, Martyred in Alexandria |
| Amatus, Solider, Martyred at Nyon (Neuss) on Lake Geneva, Switzerland |
| Ambrose (Edward) Barlow, English Benedictine Monk, Martyr |
| Ambrose, Bishop of Milan and Father of the Church |
| Amelberga (Amalberga) of Rodin, Flanders, Virgin |
| Amon, Egyptian Abbot |
| Ampelius, Egyptian Hermit, Patron of Blacksmiths |
| Anacleto Gonzalez Flores, Mexican Layman, Cristero Martyr |
| Anacletus, Pope and Martyr |
| Ananias (Hananiah) of Damascus, Bishop and Martyr, who baptized St. Paul |
| Anastasia of Rome, Virgin and Martyr |
| Anastasia of Sirmium, Virgin and Martyr |
| Anastasia the Patrician of Constantinople, Hermitess |
| Anastasius I, Patriarch of Antioch |
| Anastasius the Persian, Martyr |
| Anastasius XVIII, Archbishop of Sens |
| Anastasius, Bishop of Brescia |
| Anastasius, First Archbishop of Hungary, Friend of St. Stephen of Hungary |
| Anastazja Mieszkowna of Poland, Duchess of Pomerania |
| Anathoile-Francoise Thoulier, Poor Clare Mystic |
| Anatolia of Thora, on Lake Velino, Italy, Martyr |
| Anatolianus |
| Anatolius, Bishop (either of Constantinople or of Laodicia) |
| Anatolius, Bishop of Milan |
| Andre (Arnold) Bessette, Canadian Holy Cross Brother |
| Andrea Dotti, Servite Priest |
| Andreas Sola y Molist, Mexican Claretian Priest, Cristero Martyr |
| Andrei Rublev, Russian monk, great Iconographer |
| Andrew Avellino (baptized “Lancelot”), Theatine Priest |
| Andrew Bobola, Jesuit Priest, Martyr |
| Andrew Calibita |
| Andrew Corsini, Carmelite Bishop of Fiesole |
| Andrew Hubert Fournet, Priest, Co-founder of the Daughters of the Cross |
| Andrew Kim Taegon, Jesuit Priest, First Korean Priest, Martyr |
| Andrew of Montereale, Augustinian Priest |
| Andrew Phu Yen, Catechist, Protomartyr of Viet Nam |
| Andrew the Apostle |
| Andrew, Archbishop of Crete |
| Andronicus, Martyr |
| Andronikos, husband of Athanasia |
| Anectus of Cesarea, Martyr |
| Angadrisma, daughter of Bishop Robert I of Tours, Abbess of Oroce-des-Vierges |
| Angela Merici, Foundress of the Ursulines |
| Angela of Foligno |
| Angela of the Cross, Spanish Carmelite Mystic |
| Angelico (Fra Angelico), (Fra Giovanni da Fiesole, born Guido di Pietro) Dominican Renaissance artist |
| Angelina, Despotissa, Albanian Queen of Serbia, Matron |
| Angelo Agostini Mezzinghi, Carmelite Priest |
| Angelo of Furcio, Augustinian Priest |
| Angelo Paoli, Carmelite Priest |
| Angelus (Angelo) of Jerusalem (of Sicily), Carmelite Martyred in Sicily |
| Angus McNisse (Macinisius), 1st Bishop/Abbot of Kells, appointed by St. Patrick |
| Anianus (Aignan), Bishop of Orleans, Confessor |
| Anianus, Second Patriarch of Alexandria |
| Aniceto Adolfo (Manuel Seco Guitierrex), Christian Brother, Martyr of Turon |
| Anicetus, Pope |
| Ann Lyne, Martyred under Queen Elizabeth I |
| Anna Maria Taigi, Widow, Prophet |
| Anna Schaeffer. Bavarian Mystic and Stigmatic |
| Anna, Grand Duchess of Novgorod, Grand Princess of Kiev |
| Anne Catherine Emmerich, Augustinian nun, ecstatic, stigmatic |
| Anne of St. Bartholomew, dear friend and secretary of Teresa of Avila |
| Anne, Mother of Our Lady |
| Anne-Marie Javouhey, Nun, Foundress of the Institute of St. Joseph of Cluny |
| Annibale (Hanibal) Maria di Francia, Priest, Servant of the Poor |
| Anno II, Archbishop of Cologne |
| Anonimus, Martyr |
| Anselm, Abbot of Fanano |
| Anselm, Abbot of Nonatola |
| Anselm, Archbishop of Canterbury and Doctor of the Church |
| Anselm, Martyr |
| Ansfrid, Count and Bishop of Utrecht |
| Ansgar (Oscar), Archbishop of Bremen, Apostle to Scandinavia |
| Ansovinus, Bishop of Camerino |
| Ansurio (Iscarus), Bishop of Orense, Spain |
| Anthelm, Carthusian Bishop of Belley |
| Anthimus of Rome, Priest and Martyr |
| Antholin (Anatolianus) of Palmiers, Martyr |
| Anthony Baldinucci, Jesuit Priest, Preacher of Missions |
| Anthony Claret, Archbishop of Havana and Founder of the Claretians |
| Anthony dei Vici, of Stroncone, Franciscan Lay Brother |
| Anthony Fernandez, Jesuit Lay Brother |
| Anthony Francisco, Jesuit Priest, Martyred in India |
| Anthony Maria Pucci, Confessor |
| Anthony Maria Zaccaria, Priest, Founder of the Barnabites |
| Anthony Mary Gianelli, Bishop of Bobbio |
| Anthony Neyrot, Dominican Priest, Martyr |
| Anthony of Amandola, Augustinian Priest |
| Anthony of Kiev, Co-Founder of Kiev’s Monastery of the Caves |
| Anthony of Lerins, Hermit |
| Anthony of Padua, Franciscan Priest |
| Anthony the Great of Egypt, Abbot |
| Anthony Turner, English Jesuit Priest, Martyr |
| Anthony, Abbot of Siya, Novgorod |
| Anthusa of Constantinople, Princess, Founding Abbess of the Omona Monastery |
| Anthusa of Mantinea, Byzantine Abbess |
| Antiochus of Anastasiopolis, Martyr |
| Antipas, First Pishop of Pergamon, martyr mentioned in Revelation 2 |
| Antoine Daniel, Jesuit Priest, One of the North American Martyrs |
| Antonia of Florence, Poor Clare |
| Antonia, Martyr |
| Antonina of Nicaea, Martyr |
| Antoninus, Archbishop of Milan |
| Antoninus, Dominican Archbishop of Florence |
| Antonius, Martyr |
| Aphraates (Pharhadh) Persian Sage, Bishop |
| Aphrodise (Aphrodisius), First Bishop of Beziers, Martyr |
| Apollinaris Syncletica of Egypt, Virgin |
| Apollinaris, Bishop of Hierapolis |
| Apollinaris, First Bishop of Ravenna and Martyr |
| Apollonia of Alexandria, Virgin and Martyr |
| Apollonius of Alexandria, Priest, Martyr |
| Apollonius the Apollogist, Roman Senator and Martyr |
| Apotheme (Apothemius), Bishop of Angers |
| Apphianus of Casearea, Martyr |
| Apuleius of Rome, Martyr |
| Aquila, Disciple of Paul, Martyr Aquillina of Byblos, Virgin and Martyr |
| Aquillinus, Bishop of Evreux |
| Arcacius, Bishop of Militene, Armenia |
| Archangela Girlani of Mantua, Carmelite Mystic |
| Archangelo Canetuli, Augustinian Canon, died as Archbishop-elect of Florence |
| Aretas of Najran, Arabia, Martyr |
| Arialdo da Carimate of Milan, Deacon and Martyr |
| Arialdus, Deacon and Martyr |
| Aristides of Athens, Apologist, Martyr |
| Aristo of Alexandria, Priest, Martyr |
| Ariston of Porto, Martyr |
| Armel of Brittany, Abbot of Saint-Armel-des-Boscheaux and Plou-Remel Monasteries |
| Armentarius, Bishop of Pavia |
| Arminius, Martyred with his mother in Egypt |
| Armogastes, Vandal Courtier, Martyr |
| Arnold (Arnulph), Bishop of Soissons |
| Arnold Janssen, Priest, Founder of the Divine Word Missionaries |
| Arnulph, Bishop of Metz |
| Arquimimus, Vandal Companion of Armogastes, Martyr |
| Arsenius the Great, Roman Deacon, Imperial Tutor, Hermit in Egypt |
| Artaldus, Bishop of Belley |
| Artemas, Martyred in Puozzoli |
| Artemis the Great, Martyr, Arian prefect of Egypt; persecuted St. Athanasius |
| Artemius of Antioch,Soldier, Megalomartyr |
| Arthemia, Martyr |
| Asaph, Bishop of St. Asaph, Wales |
| Asella of Rome, Virgin and Hermitess |
| Aspren, First Bishop of Naples |
| Aspretanus, Bishop of Naples |
| Assicus (Asaco), Bishop of Elphin, Roscommon, Ireland |
| Associatus, Martyr |
| Associatus, Martyr |
| Assunta Marchetti, foundress of the Missionary Sisters of St. Charles Borromeo (Scalabrinian Sisters) |
| Assunta Maria Pallotta, Nun, Missionary to China |
| Asteria of Bergamo, Virgin and Martyr |
| Asterius of Ostia, Martyr |
| Asterius, Bishop of Petra, Arabia |
| Athanasia, Martyr |
| Athanasia, wife of Andronikos |
| Athanasios of Athos, Monk, Founder of Mount Athos |
| Athanasius, Patriarch of Alexandria and Father of the Church |
| Athenodorus of Mesopotamia, Syrian Monk, Martyr |
| Atilano Cruz Alvarado, Mexican Priest, Cristero Martyr |
| Atilano, First Bishop of Zamora |
| Attala, Alsatian Abbess |
| Attalus, Second Abbot of Bobbio |
| Atto, Bishop of Pistoia, Italy |
| Attracta (Adracht) Killlaraght, Irish Abbess |
| Aubin (Albinus), Bishop of Angers |
| Audactus, Martyr |
| Auditor, Confessor, Companion of St. Austremonius |
| Audomarus (Omer), Bishop of Thérouanne |
| Auguso Andres (Roman Martinez Fernandez), Christian Brother, Martyr of Turon |
| Augusta of Rome, Empress and Martyr |
| Augustin Caloca Cortes, Mexican Priest, Cristero Martyr |
| Augustina Pietrantoni, Sister of Charity, Murdered at Santo Spirito Hospital, Rome |
| Augustine Webster, Carthusian Prior of Axholme, Martyr |
| Augustine, Archbishop of Canterbury |
| Augustine, Bishop of Hippo and Father of the Church |
| Augustus (Augustine) Tolton, African American Chicago Priest |
| Augustus, Martyr |
| Aurea (Chryse) of Ostia (of Rome), Virgin and Martyr |
| Aurea (Oria) of San Millan, Spanish Anchoress |
| Aurea of Cordoba, Virgin and Martyr |
| Aurelia of Strasbourg, Virgin and Hermitess |
| Aurelia, Virgin and Martyr |
| Aurelius of Cordoba, Martyr |
| Aurelius, Bishop of Carthage, Martyr |
| Aurelius, Bishop of LePuy |
| Aurelius, Martyr |
| Aurora, Virgin and Martyr |
| Austindus, Bishop of Auch |
| Austreberta, Benedictine Abbess of Pavilly, Normandy |
| Austregisil (Outrille), Bishop of Bourges |
| Austremonius, Bishop and Martyr, Apostle to Auvergne |
| Austrufle, Abbot of Fontenelle |
| Autbert, Bishop of Avranches |
| Auxentius of Bithynia, Syrian Hermit |
| Aventor, Martyr, Patron of Turin |
| Avertanus, Carmelite Lay Brother |
| Avertinus of Troyes |
| Avertinus of Vencay, English Gilbertine Hermit (friend of Thomas a Becket) |
| Avitus, Bishop of Vienne |
| Avitus, Martyr |
| Aya, Matron, patroness of lawsuits |
| Azarias, Martyr |
| Azelia (Zelie) Guerin Martin, Mother of St. Therese of Lisieux |