| Celebration | Name | Saint | Birth | Death |
|---|---|---|---|---|
| 15 of July | Ansuerus | Saint Ansuerus and companions | 1066 Germany | |
| 7 of December | Anthenodore | Saint Anthenodore | Syrian arab republic | 304 Syrian arab republic |
| 11 of May | Anthimus | Saint Anthimus of Rome | Italy | |
| 13 of December | Anthiocus | Saint Anthiocus | France | France |
| 16 of July | Anthiocus | Saint Anthiocus of Anastasiópolis | Turkey | |
| 19 of October | Anthony | Saint Anthony Daniel | 1648 Canada | |
| 29 of April | Anthony | Saint Anthony Kim Song-u | Korea, republic of | 1841 Korea, republic of |
| 24 of September | Anthony | Saint Anthony González | Spain | 1637 Japan |
| 17 of June | Antidius | Saint Antidius of Besançon | 411 France | |
| 27 of April | Antimus | Saint Antimus bishop and martyr | ||
| 11 of April | Antipas | Saint Antipas | Turkey | |
| 4 of May | Antonina | Saint Antonina of Nicea | Turkey | |
| 30 of September | Antoninus | Saint Antoninus of Piacenza | Italy | |
| 2 of September | Antoninus | Saint Antoninus of Apamea | Syrian arab republic | |
| 27 of August | Antusa | Saint Antusa mártir | ||
| 22 of November | Apfias | Saint Apfias | ||
| 22 of November | Apia | Saint Apia | Turkey | Turkey |
| 20 of July | Apollinaris | Saint Apollinaris of Ravenna | Italy | |
| 10 of April | Apollonius | Saint Apollonius of Alexandria | Egypt | |
| 21 of April | Apollonius | Saint Apollonius philosopher | 185 Italy | |
| 10 of July | Apollonius | Saint Apollonius of Sardes | Italy | |
| 9 of February | Apolonia | Saint Apollonia of Alexandria | 250 Egypt | |
| 2 of February | Aproniano | Saint Aproniano martyr | ||
| 23 of January | Aquila | Saint Aquila | Algeria | |
| 13 of June | Aquilina | Saint Aquilina virgen y mártir | ||
| 12 of January | Arcadius | Saint Arcadius | 304 Algeria | |
| 23 of August | Archelaus | Saint Archelaus of Ostia | Italy | |
| 29 of March | Archinimus | Saint Archinimus martyr | 462 | |
| 14 of December | Ares | Saint Ares | Israel | 309 Israel |
| 24 of October | Arethas | Saint Arethas and companions | 523 Saudi arabia | |
| 10 of June | Aretius | Saint Aretius martyr | ||
| 2 of January | Argeus | Saint Argeus martyr | Italy | |
| 28 of June | Argimiro | Saint Argimiro of Cordoba | 856 Spain | |
| 27 of June | Ariald | Saint Ariald of Milan | 1066 Italy | |
| 3 of September | Aristeus | Saint Aristeo bishop | ||
| 21 of April | Aristo | Saint Aristus of Alexandria | Egypt | |
| 2 of July | Ariston | Saint Ariston martyr | 285 Italy | |
| 13 of December | Ariston | Saint Ariston | ||
| 17 of May | Arius | Saint Arius of Alexandria | Egypt | |
| 29 of March | Armogastes | Saint Armogastes | 462 | |
| 25 of January | Artemas | Saint Artemas | Italy | |
| 1 of September | Arthur | Saint Arthur of Ireland | Ireland | 1282 |
| 20 of January | Ascla | Saint Ascla of Antinoe | Egypt | |
| 10 of August | Asteria | Saint Asteria of Bérgamo | Italy | |
| 23 of August | Asterius | Saint Asterius of Egea | 303 Turkey | |
| 3 of March | Asterius | Saint Asterius, senator and martyr | 260 Israel | |
| 19 of October | Asterius | Saint Asterius matyr | Italy | |
| 27 of May | Atanasius | Saint Atanasius Bazzekuketta | Uganda | 1886 Uganda |
| 14 of December | Ateo | Saint Atheus | Egypt | 250 Egypt |
| 5 of July | Athanasius | Saint Athanasius of Jerusalem | 452 Israel | |
| 16 of July | Athenogenes | Saint Athenogenes | 305 Armenia | |
| 16 of May | Audas | Saint Audas, bishop and martyr | 375 Iran | |
| 9 of July | Audax | Saint Audax of Velino | 251 Italy | |
| 21 of March | Augustine | Saint Augustine Zhao Rong | 1815 China | |
| 24 of November | Augustine | Saint Augustine Schoeffler | 1851 Viet nam | |
| 1 of March | Augustus | Saint Augustus Chapdelaine | France | 1856 China |
| 20 of May | Áurea | Saint Áurea mártir | Italy | |
| 19 of July | Áurea | Saint Áurea of Córdoba | 856 Spain | |
| 2 of December | Aurelia | Saint Aurelia | ||
| 16 of June | Aureus | Saint Aureus and martyr companions | Belgium | |
| 19 of June | Aurora | Saint Aurora, virgen y mártir | ||
| 12 of September | Autonomus | Saint Autonomus of Bithynia | Turkey | |
| 13 of June | Aventinus | Saint Aventinus martyr | ||
| 27 of January | Avitus | Saint Avitus martyr | ||
| 16 of December | Azarias | Saint Azarias martyr | ||
| 19 of November | Azas | Saint Azas | Turkey | Turkey |
| 7 of October | Bacchus | Saint Bacchus of Betsaloe | Syrian arab republic | |
| 20 of December | Bajulus | Saint Bajulus | ||
| 31 of March | Balbina | Saint Balbina | Italy | |
| 15 of June | Bárbara | Saint Bárbara Cui Lianzhi | 1900 China | |
| 4 of December | Bárbara | Saint Barbara of Nicomedia | Turkey | Turkey |
| 19 of November | Barlaam | Saint Barlaam | Syrian arab republic | |
| 27 of November | Barlaan | Saint Barlaan martyr | ||
| 18 of November | Bárula | Saint Bárula mártir | ||
| 21 of August | Basa | Saint Basa y sus tres hijos | Greece | |
| 22 of March | Basil | Saint Basil of Ancira | 362 Turkey | |
| 26 of April | Basil | Saint Basil | 322 Italy | |
| 20 of November | Basil | Saint Basil of Antioch | Syrian arab republic | |
| 22 of September | Basila | Saint Basila of Roma | 304 Italy | |
| 12 of June | Basilides | Saint Basilides martyr | 303 Italy | |
| 30 of June | Basilides | Saint Basilides of Alexandria | 202 Egypt | |
| 28 of November | Basilio | Saint Basilio mártir | ||
| 3 of September | Basilisa | Saint Basilisa of Nicomedia | Turkey | |
| 22 of May | Basilisk | Saint Basilisk of Comana | Turkey | |
| 5 of December | Bassus | Saint Bassus | ||
| 20 of May | Baudilius | Saint Baudilius of Nimes | France | |
| 26 of November | Belino | Saint Belino | Italy | 1151 Italy |
| 13 of February | Benigno | Saint Benignus of Todi | France | France |
| 1 of November | Benignus | Saint Benignus of Dijon | France | |
| 15 of June | Benilde | Saint Benilde of Córdoba | Spain | 853 Spain |
| 31 of March | Benjamin | Saint Benjamin of Argol | 420 Iran | |
| 16 of January | Berard | Saint Berard | 1226 Morocco | |
| 11 of June | Bernabé | Saint Barnabas Apostle | Cyprus | 70 Cyprus |
| 27 of February | Besa | Saint Besa | Egypt | |
| 10 of July | Bianor | Saint Bianor of Pisidia | ||
| 2 of December | Bibiana | Saint Bibiana | Italy | Italy |
| 22 of April | Bicor | Saint Bicor | ||
| 23 of June | Bilius | Saint Bilius of Vannes | 914 France | |
| 10 of May | Blanda | Saint Blanda mártir | ||
| 3 of February | Blas | Saint Blaise | Armenia | 316 Armenia |