| Celebration | Name | Saint | Birth | Death |
|---|---|---|---|---|
| 1 of July | Aarón | Saint Aarón of Carlon | 304 United kingdom | |
| 19 of January | Abacus | Saint Abacus | Iran | 270 Iran |
| 30 of July | Abdon | Saint Abdon of Rome | Italy | |
| 8 of July | Abrahamitas | Saints monjes abrahamitas | ||
| 2 of March | Absalon | Saint Absalon | ||
| 15 of July | Abudemius | Saint Abudemius of Tenedos | Greece | |
| 11 of July | Abundio | Saint Abundio of Córdoba | 854 Spain | |
| 16 of September | Abundius | Saint Abundius and companions | 304 Italy | |
| 28 of July | Acacius | Saint Acacius of Miletus | 311 Turkey | |
| 27 of November | Acacius | Saint Acacius martyr | ||
| 8 of May | Acacius | Saint Acacius of Bizancio | Turkey | |
| 16 of January | Accursius | Saint Accursius | 1226 Morocco | |
| 12 of May | Achilleus | Saint Achilleus | 98 Italy | |
| 2 of November | Acindino | Saint Acindinus and companions | Iran | Iran |
| 17 of November | Acisclo | Saint Acisclo of Cordoba | Spain | 303 Spain |
| 19 of September | Acucio | Saint Acucio martyr | ||
| 23 of April | Adalbert | Saint Adalbert of Prague | 997 Czech republic | |
| 20 of September | Adelpreto | Saint Adelpreto of Arco | 1172 Italy | |
| 16 of January | Adjutus | Saint Adjutus | 1226 Morocco | |
| 2 of December | Adria | Saint Adria | ||
| 17 of September | Adriana | Saint Adrian of Frisia | Turkey | Turkey |
| 5 of March | Adriano | Saint Adrian, martyr | 309 Israel | |
| 20 of November | Adventor | Saint Adventor of Turín | Italy | 286 Italy |
| 12 of June | Aeschylus | Saint Aeschylus | United kingdom | 1080 Sweden |
| 7 of August | Afra | Saint Afra of Augsburgo | 304 Germany | |
| 5 of August | Afra | Saint Afra of Ausburgo | 304 Austria | |
| 1 of April | Agape | Saint Agape | 304 Macedonia, the former yugoslav republic of | |
| 18 of August | Agapetus | Saint Agapetus of Lacio | Italy | Italy |
| 28 of April | Agapius | Saint Agapius of Cirta | 259 | |
| 21 of November | Agapius | Saint Agapius of Cesarea | 306 Israel | |
| 23 of January | Agathangelo | Saint Agathangelo | Turkey | |
| 5 of July | Agathon | Saint Agathon of Sicilia | Italy | |
| 7 of December | Agathon | Saint Agathon | ||
| 21 of August | Agathonicus | Saint Agathonicus and companions | Turkey | |
| 4 of April | Agathopodus | Saint Agathopodus | Macedonia, the former yugoslav republic of | |
| 24 of June | Agilbert | Saint Agilbert and companions | 273 France | |
| 25 of January | Agileus | Saint Agileus | Tunisia | |
| 24 of June | Agoardus | Saint Agoardus martyr | 273 France | |
| 4 of November | Agricola | Saint Agricola of Bologna | 304 Italy | |
| 23 of June | Agripina | Saint Agripina of Roma | Italy | |
| 1 of February | Agrippano | Saint Agrippano bishop and martyr | France | |
| 5 of February | Águeda | Saint Agatha | 251 Italy | |
| 9 of January | Águeda | Saint Águeda Yi Sosa | Korea, republic of | 1838 Korea, republic of |
| 22 of April | Aitala | Saint Aitala | ||
| 22 of June | Albanus | Saint Albanus of Verulamio | 287 United kingdom | |
| 24 of November | Albert | Saint Albert of Louvain | France | 1192 France |
| 14 of September | Albert | Saint Albert of Castel Gualtieri | 1215 Israel | |
| 21 of November | Alberto | Saint Alberto of Lieja | Spain | 1192 Spain |
| 24 of November | Aleander martyr | Saint Alexander Martyr | ||
| 1 of December | Alexander | Saint Alexander Briant | United kingdom | 1581 United kingdom |
| 27 of March | Alexander | Saint Alexander of Drizipara | ||
| 18 of March | Alexander | Saint Alexander of Jerusalem | 250 Israel | |
| 14 of March | Alexander | Saint Alexander of Pydna | 390 Macedonia, the former yugoslav republic of | |
| 26 of August | Alexander | Saint Alexander of Bergamo | Italy | |
| 3 of May | Alexander | Saint Alexander I Pope | Italy | Italy |
| 24 of April | Alexander | Saint Alexander of Lyon | 178 France | |
| 21 of September | Alexander | Saint Alexander of Baccano | Italy | |
| 6 of June | Alexander | Saint Alexander of Fiesole | Italy | 823 Italy |
| 1 of January | Almachius | Saint Almachius | 391 | |
| 22 of October | Alodia | Saint Alodia of Huesca | 851 Spain | |
| 17 of November | Alphaeus | Saint Alphaeus of Cesarea | 303 Israel | |
| 19 of April | Alphege | Saint Alphege of Canterbury | 1012 United kingdom | |
| 10 of June | Amantius | Saint Amantius martyr | ||
| 7 of November | Amaranth | Saint Amaranth of Albi | Italy | |
| 3 of December | Ambicus | Saint Ambicus | ||
| 20 of December | Ammonius | Saint Ammonius | ||
| 12 of December | Amonaria | Saint Amonaria | ||
| 26 of November | Amonius | Saint Amonius | ||
| 20 of November | Ampelus | Saint Ampelus martyr | ||
| 2 of April | Amphianus | Saint Amphianus | 306 Israel | |
| 31 of October | Ampliatus | Saint Ampliatus martyr | ||
| 27 of February | Ana | Saints Ana Line y compañeros | 1601 United kingdom | |
| 22 of November | Ananias | Saint Ananias | Iraq | 345 Iraq |
| 25 of December | Anastasia | Saint Anastasia | Italy | |
| 5 of December | Anastasio | Saint Anastasius | ||
| 14 of June | Anastasio | Saint Anastasius of Cordoba | Spain | 853 Spain |
| 22 of January | Anastasius | Saint Anastasius monk and martyr | 628 Iran | |
| 20 of April | Anastasius | Saint Anastasius of Antioch | 609 Syrian arab republic | |
| 26 of August | Anastasius | Saint Anastasius the Fuller | Croatia (Hrvatska) | |
| 21 of December | Anastasius | Saint Anastasius martyr | ||
| 6 of February | Anatolia | Saint Anatolia martyr | France | |
| 9 of July | Anatolia | Saint Anatolia of Velino | 251 Italy | |
| 1 of May | Andeolus | Saint Andeolus | France | |
| 30 of November | Andrés | Saint Andrew Apostle | Israel | Israel |
| 24 of November | Andrés | Saints Andrés Dung Lac y compañeros | 1839 | |
| 20 of September | Andrés | Saint Andrew Kim Taegon and companions | 1846 Korea, republic of | |
| 20 of October | Andrew | Saint Andrew Calibytis | Greece | 767 Turkey |
| 16 of May | Andrew | Saint Andrew Bobola | 1591 Poland | 1657 Poland |
| 26 of May | Andrew | Saint Andrew Kaggwa | Uganda | 1886 Uganda |
| 23 of January | Andrew | Saint Andrew Chong Hwagyong | 1840 Korea, republic of | |
| 15 of July | Andrew | Saint Andrew Nguyên Kim Thông Nam | 1855 Viet nam | |
| 28 of November | Andrew | Saint Andrew Tran Van Trông | China | 1835 China |
| 19 of August | Andrew | Saint Andrew of Cilicia and companions | ||
| 27 of June | Anectus | Saint Anectus of Cesarea | Israel | |
| 5 of May | Angelo | Saint Angelo of Sicilia | 1225 Italy | |
| 17 of April | Aniceto | Saint Anicetus Pope | Syrian arab republic | 166 Italy |
| 12 of August | Anicetus | Saint Anicetus of Nicomedia | Turkey | |
| 30 of December | Anisia | Saint Anisia mártir | ||
| 28 of September | Annemund | Saint Annemund of Lyon | 658 France | |
| 1 of December | Ansan | Saint Ansan |