| Celebration | Name | Saint | Birth | Death |
|---|---|---|---|---|
| 5 of March | Adriano | Saint Adrian, martyr | 309 Israel | |
| 7 of March | Ardon | Saint Ardon Smaragdus | 843 Italy | |
| 10 of March | Attalo | Saint Attalus | 626 Italy | |
| 11 of March | Áurea | Saint Aurea of San Millán | 1042 Spain | 1070 Spain |
| 12 of March | Alphege | Saint Alphege of Winchester | 951 United kingdom | |
| 12 of March | Ángela | Blessed Angela Salawa | 1922 Poland | |
| 13 of March | Agnelo | Blessed Agnellus of Pisa | 1275 United kingdom | |
| 13 of March | Ansovinus | Saint Ansovinus | 868 Italy | |
| 14 of March | Alexander | Saint Alexander of Pydna | 390 Macedonia, the former yugoslav republic of | |
| 14 of March | Agno | Blessed Agno of Zaragoza | Spain | 1260 Spain |
| 15 of March | Artémides | Blessed Artemides Zatti | 1880 Italy | 1951 Argentina |
| 15 of March | Adalberto | Blessed Adalbert Balicki | 1948 Poland | |
| 16 of March | Abraham | Saint Patriarch Abraham | Israel | Israel |
| 16 of March | Abraham | Saint Abraham Kidunaia | Turkey | 367 Turkey |
| 17 of March | Agricola | Saint Agricola | 580 France | |
| 18 of March | Alexander | Saint Alexander of Jerusalem | 250 Israel | |
| 18 of March | Anselm | Saint Anselm of Mantua | 1086 Italy | |
| 19 of March | Andrés | Blessed Andrea Gallerani | 1251 Italy | |
| 20 of March | Ambrosio | Blessed Ambrose Sansedoni | 1287 Italy | |
| 20 of March | Ararchippus | Saint Aarchippus | ||
| 21 of March | Augustine | Saint Augustine Zhao Rong | 1815 China | |
| 23 of March | Anunciata | Blessed Anunciata Cocchetti | 1882 Italy | |
| 27 of March | Alexander | Saint Alexander of Drizipara | ||
| 28 of March | Antonio | Blessed Antonio Patrizi | 1311 Italy | |
| 29 of March | Archinimus | Saint Archinimus martyr | 462 | |
| 29 of March | Armogastes | Saint Armogastes | 462 | |
| 31 of March | Amós | Saint Amos, prophet | ||
| 31 of March | Agilulfus | Saint Agilulfus | 752 Germany | |
| 31 of March | Amadeo | Blessed Amadeus of Savoy | Italy | 1472 Italy |
| 1 of April | Agape | Saint Agape | 304 Macedonia, the former yugoslav republic of | |
| 2 of April | Abundius | Saint Abundius | 468 Italy | |
| 2 of April | Amphianus | Saint Amphianus | 306 Israel | |
| 4 of April | Agathopodus | Saint Agathopodus | Macedonia, the former yugoslav republic of | |
| 5 of April | Albert | Saint Albert of Montecorvino | 1127 Italy | |
| 7 of April | Aibert | Saint Aibert | 1140 Belgium | |
| 7 of April | Alejandro | Blessed Alexander Rawlins | 1595 United kingdom | |
| 8 of April | Asyncritus | Saint Asynctirus | Italy | Italy |
| 8 of April | Agabus | Saint Agabus prophet | ||
| 8 of April | Amantius | Saint Amantius of Como | Italy | 449 Italy |
| 9 of April | Aldegundis | Saint Aldegundis | Belgium | |
| 9 of April | Acacius | Saint Acacius of Mesopotamia | Iraq | |
| 9 of April | Antonio | Blessed Antonio Pavoni | 1374 Italy | |
| 10 of April | Apollonius | Saint Apollonius of Alexandria | Egypt | |
| 10 of April | Antonio | Blessed Anthony Neyrot | 1460 Tunisia | |
| 11 of April | Ángel | Blessed Angelo di Chivasso Carletti | 1495 Italy | |
| 11 of April | Antipas | Saint Antipas | Turkey | |
| 12 of April | Alferius | Saint Alferius | 1050 France | |
| 13 of April | Albertini | Blessed Albertini | 1294 Italy | |
| 14 of April | Asacus | Saint Asacus | Ireland | |
| 15 of April | Abundius | Saint Abundius of Roma | 564 | |
| 17 of April | Aniceto | Saint Anicetus Pope | Syrian arab republic | 166 Italy |
| 17 of April | Acacius | Saint Acacius of Melitene | 435 Armenia | |
| 18 of April | Atanasia | Saint Atanasia | Greece | |
| 18 of April | Antusa | Saint Antusa | Turkey | |
| 18 of April | Andrés | Blessed Andrea of Montereale | 1479 Italy | |
| 18 of April | Andrés | Blessed Andres Hibernon | 1602 Spain | |
| 19 of April | Alphege | Saint Alphege of Canterbury | 1012 United kingdom | |
| 20 of April | Antonio | Blessed Anthony Page | 1593 United kingdom | |
| 20 of April | Anastasio | Blessed Anastasius Pankiewicz | Austria | |
| 20 of April | Anastasius | Saint Anastasius of Antioch | 609 Syrian arab republic | |
| 21 of April | Anselmo | Saint Anselm of Canterbury | 1033 Italy | 1109 United kingdom |
| 21 of April | Aristo | Saint Aristus of Alexandria | Egypt | |
| 21 of April | Apollonius | Saint Apollonius philosopher | 185 Italy | |
| 21 of April | Anastasius | Saint Anastasius hegumen | 700 | |
| 22 of April | Aitala | Saint Aitala | ||
| 22 of April | Agapetus | Saint Agapetus I papa | 536 Turkey | |
| 22 of April | Acépsimas | Saint Acépsimas | ||
| 23 of April | Adalbert | Saint Adalbert of Prague | 997 Czech republic | |
| 24 of April | Anthimus | Saint Anthimus of Nicomedia | 303 Turkey | |
| 24 of April | Alexander | Saint Alexander of Lyon | 178 France | |
| 25 of April | Anianus | Saint Anianus | 67 Egypt | |
| 27 of April | Antimus | Saint Antimus bishop and martyr | ||
| 27 of April | Acard | Saint Acard Biahop | ||
| 28 of April | Agapius | Saint Agapius of Cirta | 259 | |
| 28 of April | Aphrodisius | Saint Aphrodisius of Béziers | France | |
| 29 of April | Anthony | Saint Anthony Kim Song-u | Korea, republic of | 1841 Korea, republic of |
| 29 of April | Achard | Saint Achard of Avranches | 1172 Switzerland | |
| 30 of April | Aulus | Saint Aulus | France | |
| 30 of April | Adjutor | Saint Adjutor | 1131 France | |
| 1 of May | Asaph | Saint Asaph | United kingdom | |
| 1 of May | Arigius | Saint Arigius of Gap | France | 604 France |
| 1 of May | Amator | Saint Amator of Auxerre | France | 418 France |
| 1 of May | Aldebrando | Blessed Aldebrandus | 1170 | |
| 1 of May | Andeolus | Saint Andeolus | France | |
| 2 of May | Atanasio | Saint Athanasius | 297 Egypt | 373 Egypt |
| 3 of May | Alexander | Saint Alexander I Pope | Italy | Italy |
| 3 of May | Ansfried | Saint Ansfried | Netherlands | 1008 Belgium |
| 4 of May | Antonina | Saint Antonina of Nicea | Turkey | |
| 5 of May | Angelo | Saint Angelo of Sicilia | 1225 Italy | |
| 5 of May | Avertinus | Saint Avertinus of Vençay | 1189 France | |
| 6 of May | Ana | Blessed Anna Rosa Gattorno | 1831 Italy | 1900 Italy |
| 7 of May | Augustin | Saint Augustin Roscelli | 1818 Italy | 1902 Italy |
| 7 of May | Anthony | Saint Anthony of Kiev | 1073 Ukraine | |
| 7 of May | Alberto | Blessed Albert of Bergamo | 1279 Italy | |
| 8 of May | Acacius | Saint Acacius of Bizancio | Turkey | |
| 8 of May | Ángel | Blessed Angelo of Massaccio | 1458 Italy | |
| 8 of May | Amado | Blessed Amatus Ronconi | Italy | |
| 8 of May | Arsenius | Saint Arsenius of Scete | Italy | Egypt |
| 10 of May | Antoninus | Saint Antoninus of Florence | 1389 Italy | 1459 Italy |
| 11 of May | Anthimus | Saint Anthimus of Rome | Italy |