| Celebration | Name | Saint | Birth | Death |
|---|---|---|---|---|
| 13 of November | Abbon | Saint Abbon of Fleury | 1004 France | |
| 29 of April | Achard | Saint Achard of Avranches | 1172 Switzerland | |
| 4 of December | Ada | Saint Ada | France | 692 France |
| 2 of January | Adalard | Saint Adalard | 826 France | |
| 25 of June | Adalbert | Saint Adalbert | Turkey | |
| 16 of May | Adam | Saint Adam of Fermo | 1210 Italy | |
| 23 of September | Adamnan | Saint Adamnan of Hy | 704 United kingdom | |
| 5 of February | Adelaida | Saint Adelaida | 1015 Germany | |
| 30 of January | Adelelmo | Saint Adelelmo of Burgos | 1097 Spain | |
| 20 of October | Adelina | Saint Adelina of Savigny | 1125 France | |
| 3 of February | Adelinus | Saint Adelinus of Celle | 696 Germany | |
| 11 of September | Adelphe | Saint Adelphe of Luxeuil | 670 France | |
| 9 of January | Adrian | Saint Adrian abbot | 710 United kingdom | |
| 2 of November | Agaune | Saint Agaune abbot | ||
| 30 of August | Agilus | Saint Agilus of Rebais | 650 France | |
| 14 of December | Agnelo | Saint Agnelo | Italy | 596 Italy |
| 27 of May | Agustín | Saint Augustine of Canterbury | 605 United kingdom | |
| 15 of September | Aichard | Saint Aichard of Jumieges | France | |
| 31 of August | Aidan | Saint Aidan of Lindisfarne | Ireland | 651 United kingdom |
| 26 of January | Alberic | Saint Alberic abbot | 1109 France | |
| 5 of September | Albert | Saint Albert of Tortona | 1073 Italy | |
| 30 of January | Aldegunda | Saint Aldegunda of Maubeuge | 684 France | |
| 9 of April | Aldegundis | Saint Aldegundis | Belgium | |
| 25 of February | Aldetrudis | Saint Aldetrudis | 526 Belgium | |
| 12 of April | Alferius | Saint Alferius | 1050 France | |
| 9 of February | Alto | Saint Alto | Ireland | Germany |
| 28 of January | Amadeus | Saint Amadeus of Lausanne | 1110 France | 1159 Switzerland |
| 13 of September | Amatus | Saint Amatus of Sens | 629 France | |
| 2 of November | Ambrose | Saint Ambrose of Agauno | 520 Switzerland | |
| 21 of April | Anastasius | Saint Anastasius hegumen | 700 | |
| 14 of October | Angadrisma | Saint Angadrisma of Beauvais | 695 France | |
| 18 of February | Angilbert | Saint Angilbert abbot | 814 France | |
| 4 of December | Annon | Saint Annon of Cologne | Germany | 1075 Germany |
| 9 of February | Ansbert | Saint Ansbert | 695 France | |
| 3 of March | Anselm | Saint Anselm of Nonántola | 803 Italy | |
| 15 of July | Ansuerus | Saint Ansuerus and companions | 1066 Germany | |
| 14 of February | Antoninus | Saint Antoninus | 830 Italy | |
| 17 of January | Antonio | Anthony the Great | 251 | 356 Egypt |
| 11 of February | Ardanus | Saint Ardanus | 1066 France | |
| 25 of August | Aredius | Saint Aredius | 591 France | |
| 1 of May | Asaph | Saint Asaph | United kingdom | |
| 3 of December | Atalia | Saint Atalia | ||
| 5 of July | Athanasius | Saint Athanasius of Athos | 920 Turkey | 1003 Greece |
| 11 of August | Atracta | Saint Atracta | Ireland | |
| 10 of March | Attalo | Saint Attalus | 626 Italy | |
| 22 of May | Atto | Saint Atto of Pistoia | 1153 Italy | |
| 7 of October | Augustus | Saint Augustus of Bourges | 560 France | |
| 4 of October | Aurea | Saint Aurea of París | 856 France | |
| 10 of February | Austreberta | Saint Austreberta | 704 France | |
| 14 of February | Auxentius | Saint Auxentius | ||
| 17 of June | Avitus | Saint Avitus of Orleans | 530 France | |
| 3 of September | Aygulf | Saint Aygulf and companions | 675 France | |
| 24 of July | Baldwin | Saint Baldwin of Rieti | 1140 Italy | |
| 19 of August | Bartholomew | Saint Bartholomew of Simero | 1130 Italy | |
| 11 of November | Bartholomew | Saint Bartholomew the Younger of Rossano | 980 Italy | 1055 Italy |
| 4 of March | Basinus | Saint Basinus | 705 Germany | |
| 12 of February | Benedict | Saint Benedict of Aniano | 821 Germany | |
| 12 of January | Benet | Saint Benet Biscop | 690 United kingdom | |
| 11 of July | Benito | Saint Benedict of Nursia | 480 Italy | 547 Italy |
| 26 of March | Bercarius | Saint Bercarius | France | 685 France |
| 2 of October | Beregise | Saint Beregise of Andage | 725 Belgium | |
| 9 of October | Bernard | Saint Bernard of Rodez | 1110 France | |
| 14 of April | Bernard | Saint Bernard of Tiron | 1117 France | |
| 25 of October | Bernardo | Saint Bernardo Calbó | 1243 Spain | |
| 20 of August | Bernardo | Saint Bernardo de Claraval | 1090 France | 1153 France |
| 4 of July | Berta | Saint Berta of Blangy | 725 France | |
| 11 of November | Berthuin | Saint Berthuin of Malonne | 698 France | |
| 5 of November | Bertila | Saint Bertila of Chelles | France | |
| 19 of August | Bertulf | Saint Bertulf of Bobbio | 639 Italy | |
| 27 of September | Bonfilius | Saint Bonfilius of Fara | 1115 Italy | |
| 30 of August | Bononius | Saint Bononius of Lucedio | 1026 Italy | |
| 24 of April | Bova | Saint Bova | ||
| 29 of November | Brandan | Saint Brandan | ||
| 16 of May | Brendan | Saint Brendan | 460 Ireland | 577 Ireland |
| 1 of May | Brieuc | Saint Brieuc | United kingdom | France |
| 1 of February | Brígida | Saint Brigid of Ireland | 525 Ireland | |
| 6 of October | Bruno | Saint Bruno of Cologne | 1030 Germany | 1101 Italy |
| 18 of July | Bruno | Saint Bruno of Segni | 1123 Italy | |
| 21 of September | Cadoc | Saint Cadoc of Lan-Carvan | France | |
| 11 of October | Canice | Saint Canice of Ireland | 599 Ireland | |
| 16 of May | Carantoc | Saint Carantoc | United kingdom | |
| 1 of July | Carileph | Saint Carileph of Anille | France | |
| 14 of May | Carthage | Saint Carthage of Lismore | 555 Ireland | 638 Ireland |
| 9 of March | Catalina | Saint Catherine of Bolongna | 1413 | 1463 Italy |
| 12 of January | Cesárea | Saint Cesárea | 529 France | |
| 28 of September | Chariton | Saint Chariton of Laura | 350 Israel | |
| 17 of August | Clara | Saint Clara of la Cruz | 1308 Italy | |
| 11 of August | Clara | Saint Clare of Assisi | 1194 Italy | 1253 Italy |
| 1 of January | Clarus | Saint Clarus | 670 France | |
| 6 of June | Claudius | Saint Claudius of Condat | 703 France | |
| 30 of March | Clino | Saint Clino | 1030 Italy | |
| 7 of June | Colman | Saint Colman of Dromore | Ireland | Ireland |
| 9 of June | Columba | Saint Columba of Iona | 521 Ireland | 597 United kingdom |
| 23 of November | Columban | Saint Columban | Ireland | 615 Ireland |
| 10 of May | Comgall | Saint Comgall | Ireland | 622 Ireland |
| 17 of February | Constable | Saint Constable | 1124 Italy | |
| 2 of December | Constantine | Saint Constantine abbot | ||
| 5 of January | Convoyon | Saint Convoyon | 868 France | |
| 7 of November | Cungar | Saint Cungar of Congresbury | France | United kingdom |
| 9 of December | Cyprian | Saint Cyprian | France | France |