| Celebration | Name | Saint | Birth | Death |
|---|---|---|---|---|
| 19 of December | Anastasius | Saint Anastasius I Pope | 401 | |
| 20 of December | Ammonius | Saint Ammonius | ||
| 21 of December | Anastasius | Saint Anastasius martyr | ||
| 23 of December | Antonio | Saint Anthony of Saint Anne Galvão | 1739 Brazil | 1822 Brazil |
| 25 of December | Anastasia | Saint Anastasia | Italy | |
| 26 of December | Archelaus | Saint Archelaus bishop | ||
| 27 of December | Alfredo | Blessed Alfredo Parte | 1899 Spain | 1936 Spain |
| 28 of December | Anthony | Saint Anthony monk | 520 France | |
| 30 of December | Anisia | Saint Anisia mártir | ||
| 30 of December | Anysia | Saint Anysia of Thessalonica | 406 | |
| 31 of December | Alano | Blessed Alain de Solminihac | 1659 France |