| Celebration | Name | Saint | Birth | Death |
|---|---|---|---|---|
| 31 of July | Calimerius | Saint Calimerius of Milan | Italy | |
| 28 of July | Camelian | Saint Camelian of Troyes | France | |
| 25 of May | Canius | Saint Canius of Atella | Italy | |
| 16 of May | Carantoc | Saint Carantoc | United kingdom | |
| 4 of November | Carlos | Saint Charles Borromeo | 1538 Italy | 1584 Italy |
| 14 of May | Carthage | Saint Carthage of Lismore | 555 Ireland | 638 Ireland |
| 5 of August | Cassian | Saint Cassian of Autun | France | |
| 11 of August | Cassian | Saint Cassian of Benevento | Italy | |
| 29 of June | Cassius | Saint Cassius | 558 Italy | |
| 21 of September | Castor | Saint Castor of Apt | 420 France | |
| 1 of December | Castritian | Saint Castritian | Italy | Italy |
| 10 of May | Catald | Saint Catald of Ireland | Ireland | Italy |
| 2 of March | Ceadda | Saint Ceadda | 672 United kingdom | |
| 1 of February | Cecilio | Saint Cecilio of Granada | Spain | |
| 26 of October | Cedda | Saint Cedda of Lastingham | 664 United kingdom | |
| 1 of April | Celsus | Saint Celsus | 1129 Ireland | |
| 10 of June | Censurius | Saint Censurius of Auxerre | France | |
| 6 of June | Ceratius | Saint Ceratius | 400 | France |
| 10 of October | Cerbonius | Saint Cerbonius of Populonia | 575 Italy | |
| 13 of June | Cetteus | Saint Cetteus of Amiterno | Italy | |
| 6 of March | Chrodegang | Saint Chrodegang | 766 France | |
| 3 of September | Chrodegang | Saint Chrodegang of Sées | France | |
| 18 of March | Cirilo | Saint Cyril of Jerusalem | 444 Israel | |
| 7 of January | Ciro | Saint Ciro | 714 Turkey | |
| 25 of April | Clarence | Saint Clarence | France | |
| 10 of October | Clarus | Saint Clarus of Nantes | France | |
| 6 of June | Claudius | Saint Claudius of Condat | 703 France | |
| 23 of November | Clemens | Saint Clemens bishop | Belgium | |
| 23 of January | Clement | Saint Clement bishop and martyr | Turkey | |
| 12 of July | Clemente | Saint Clement Ignatius Delgado Cebrián | 1761 Spain | 1838 Viet nam |
| 20 of September | Clicerius | Saint Clicerius bishop | ||
| 8 of June | Clodulf | Saint Clodulf | 660 France | |
| 6 of June | Colman | Saint Colman | 1010 United kingdom | |
| 7 of June | Colman | Saint Colman of Dromore | Ireland | Ireland |
| 24 of November | Colman | Saint Colman of Uama | 600 Ireland | |
| 29 of October | Colman | Saint Colman of Kilmacduagh | 632 Ireland | |
| 3 of May | Conleth | Saint Conleth | 520 Ireland | |
| 26 of November | Conrad | Saint Conrad | Germany | 975 Germany |
| 1 of September | Constanctius | Saint Constantius of Aquino | 570 Italy | |
| 12 of April | Constantine | Saint Constantine | France | |
| 29 of January | Constantius | Saint Constantius bishop | Italy | |
| 8 of September | Corbinian | Saint Corbinian of Freising | 670 France | 730 Germany |
| 12 of December | Corentinus | Saint Corentinus | France | France |
| 12 of September | Coronatus | Saint Coronatus bishop | ||
| 28 of November | Crescentius | Saint Crescentian | ||
| 7 of January | Crispin | Saint Crispin bishop | 467 Italy | |
| 12 of November | Cunibert | Saint Cunibert of Cologne | 663 Germany | |
| 20 of March | Cuthbert | Saint Cuthbert | 687 United kingdom | |
| 14 of September | Cyprian | Saint Cyprian of Carthage | 258 | |
| 3 of October | Cyprian | Saint Cyprian of Toulon | 543 France | |
| 27 of June | Cyril | Saint Cyril of Alexandria | 376 Egypt | 444 Egypt |
| 22 of July | Cyril | Saint Cyril of Antioch | 306 Syrian arab republic | |
| 14 of January | Dacius | Saint Dacius | 552 Italy | |
| 13 of November | Dalmatius | Saint Dalmatius of Rodez | 580 France | |
| 12 of April | Damian | Saint Damian of Pavia | 697 Italy | |
| 11 of September | Daniel | Saint Daniel Wyn | 584 United kingdom | |
| 3 of July | Datus | Saint Datus of Ravenna | 190 Italy | |
| 1 of March | David | Saint David of Wales | 601 United kingdom | |
| 24 of July | Declan | Saint Declan of Ardmore | Ireland | |
| 15 of February | Decorosus | Saint Decorosus | 680 Italy | |
| 24 of December | Delphin | Saint Delphin of Bordeaux | 404 France | |
| 10 of November | Demetrius | Saint Demetrius of Rostov | Russian federation | 1709 Russian federation |
| 10 of November | Demetrius | Saint Demetrius of Antioch | 260 | |
| 19 of June | Deodatus | Saint Deodatus of Nevers | 679 France | |
| 26 of June | Deodatus | Saint Deodatus of Nola | 405 Italy | |
| 5 of January | Deogratias | Saint Deogratias | 458 Tunisia | |
| 27 of July | Desideratus | Saint Desideratus of Besançon | France | |
| 8 of May | Desideratus | Saint Desideratus of Bourges | 550 France | |
| 23 of May | Desiderio | Saint Desiderius of Langres | 355 France | |
| 26 of May | Desiderius | Saint Desiderius of Vienne | France | France |
| 15 of November | Desiderius | Saint Desiderius of Cahors | 655 France | |
| 2 of June | Dictinus | Saint Dictinus | Spain | |
| 9 of October | Dionisio | Saint Denis of Paris and companions | France | |
| 8 of April | Dionisio | Saint Dionysious of Corinth | Greece | 180 Greece |
| 8 of April | Dionysius | Saint Dionysius of Alexandria | Egypt | 265 Egypt |
| 8 of May | Dionysius | Saint Dionysius bishop | ||
| 9 of May | Dionysius | Saint Dionysius of Vienne | France | |
| 25 of May | Dionysius | Saint Dionysius of Milán | Italy | 361 Armenia |
| 10 of January | Domitian | Saint Domitian | 602 Armenia | |
| 11 of April | Domnius | Saint Domnius of Salona | 299 Croatia (Hrvatska) | |
| 1 of December | Domnolus | Saint Domnolus | France | 581 France |
| 3 of November | Domnus | Saint Domnus of Vienne | 538 France | |
| 14 of October | Donatian | Saint Donatian of Reims | 389 Belgium | |
| 7 of August | Donatian | Saint Donatian | Belgium | |
| 7 of August | Donatus | Saint Donatus of Arezzo | Italy | |
| 7 of August | Donatus | Saint Donatus of Besançon | 568 Germany | |
| 30 of April | Donatus | Saint Donatus of Evorea | Italy | |
| 5 of June | Dorotheus | Saint Dorotheus of Tyre | 255 Lebanon | 362 Bulgaria |
| 14 of November | Dubricius | Saint Dubricius of Bardsey | United kingdom | |
| 17 of October | Dulcidius | Saint Dulcidius of Agen | Germany | |
| 22 of October | Duns | Saint Duns Scotus | Ireland | 875 Italy |
| 19 of May | Dunstan | Saint Dunstan of Canterbury | 988 United kingdom | |
| 8 of March | Duthac | Saint Duthac | 1065 United kingdom | |
| 6 of May | Eadbert | Saint Eadbert | United kingdom | 698 United kingdom |
| 26 of October | Eata | Saint Eata of Hexham | 616 United kingdom | |
| 27 of July | Eclesius | Saint Eclesius of Ravenna | 532 Italy | |
| 7 of July | Edda | Saint Edda of Winchester | 706 United kingdom | |
| 16 of November | Edmund | Saint Edmund Rich | United kingdom | 1240 France |
| 30 of December | Egwin | Saint Egwin of Worcester | 707 United kingdom | |
| 18 of February | Eladio | Saint Helladius | 632 Spain |