| Celebration | Name | Saint | Birth | Death |
|---|---|---|---|---|
| 1 of January | Clarus | Saint Clarus | 670 France | |
| 3 of January | Ciriaco | Blessed Kuriakose Elias Chavara | 1871 India | |
| 4 of January | Caius | Saint Caius martyr | Italy | Romania |
| 4 of January | Cristiana | Blessed Christina Menabuoi | 1240 Italy | 1310 Italy |
| 5 of January | Convoyon | Saint Convoyon | 868 France | |
| 5 of January | Carlos | Blessed Charles of Saint Andrew Houben | 1893 | |
| 6 of January | Charles | Saint Charles of Seze | 1670 Italy | |
| 7 of January | Crispin | Saint Crispin bishop | 467 Italy | |
| 7 of January | Ciro | Saint Ciro | 714 Turkey | |
| 7 of January | Canute | Saint Canute Lavard | 1131 Denmark | |
| 12 of January | Cesárea | Saint Cesárea | 529 France | |
| 18 of January | Cristina | Blessed Christina Ciccarelli | 1543 Italy | |
| 20 of January | Cipriano | Blessed Cyprian Iwene Tansi | Nigeria | 1964 United kingdom |
| 23 of January | Clement | Saint Clement bishop and martyr | Turkey | |
| 29 of January | Constantius | Saint Constantius bishop | Italy | |
| 30 of January | Columba | Blessed Columba Marmion | Ireland | 1923 Belgium |
| 30 of January | Carmela | Blessed Carmela Garcia Moyon | 1888 France | 1937 Spain |
| 1 of February | Cecilio | Saint Cecilio of Granada | Spain | |
| 2 of February | Catalina | Saint Catalina of Ricci | 1590 Italy | |
| 3 of February | Celerinus | Saint Celerinus of Cartaghe | Tunisia | |
| 8 of February | Cointa | Saint Cointa | 249 Egypt | |
| 10 of February | Clara | Blessed Chiara of Rimini | 1329 Italy | |
| 11 of February | Castrensis | Saint Castrensis | Italy | |
| 13 of February | Cristina | Blessed Christina Camozzi | 1458 Italy | |
| 13 of February | Castor | Saint Castor of Aquitaine | Germany | |
| 14 of February | Cyril | Saint Cyril of Thessalonica | 869 Italy | |
| 15 of February | Claude | Saint Claude La Colombière | 1682 France | |
| 17 of February | Constable | Saint Constable | 1124 Italy | |
| 19 of February | Conrado | Blessed Conrado of Piacenza Confalonieri | 1351 Italy | |
| 24 of February | Contancio | Blessed Contancio of Fabriano Servioli | 1481 Italy | |
| 28 of February | Cira | Saint Cira | Syrian arab republic | Syrian arab republic |
| 1 of March | Cristóbal | Blessed Chrsitopher of Milán | Italy | |
| 2 of March | Ceadda | Saint Ceadda | 672 United kingdom | |
| 2 of March | Carlos | Blessed Charles Bono | 1127 Belgium | |
| 3 of March | Cleónico | Saint Eutropio of Amasea | Italy | |
| 3 of March | Catalina | Saint Catalina Drexel | 1858 United States | 1955 United States |
| 3 of March | Cunegunda | Saint Cunegunda | 1039 Germany | |
| 3 of March | Celedonius | Saint Celedonius of Calahorra | Spain | |
| 3 of March | Cleonicus | Saint Cleonicus | Italy | |
| 4 of March | Casimiro | Saint Casimir | 1458 Poland | 1484 Lithuania |
| 5 of March | Cristóbal | Blessed Christopher Macassoli | 1485 Italy | |
| 5 of March | Conon | Saint Conon | 250 Greece | |
| 6 of March | Chrodegang | Saint Chrodegang | 766 France | |
| 6 of March | Coleta | Saint Coleta Boylet | 1447 Belgium | |
| 9 of March | Catalina | Saint Catherine of Bolongna | 1413 | 1463 Italy |
| 11 of March | Constantine | Saint Constantine of Scotland | United kingdom | |
| 13 of March | Cristina | Saint Christina | 559 | |
| 15 of March | Clemens | Saint Clemens Maria Hofbauer | 1820 Austria | |
| 17 of March | Conrado | Blessed Conrado of Modugno | 1154 Italy | |
| 18 of March | Cirilo | Saint Cyril of Jerusalem | 444 Israel | |
| 20 of March | Cuthbert | Saint Cuthbert | 687 United kingdom | |
| 24 of March | Catalina | Saint Catherine of Sweden | 1331 Sweden | 1381 Sweden |
| 26 of March | Castulus | Saint Castulus, martyr | Italy | Italy |
| 28 of March | Cristobal | Blessed Cristopher Wharton | 1600 United kingdom | |
| 28 of March | Conón | Blessed Conon | 1236 Italy | |
| 28 of March | Cyril | Saint Cyril of Heliopolos | 362 Lebanon | |
| 28 of March | Castor | Saint Castor of Tarsus | Turkey | |
| 30 of March | Clino | Saint Clino | 1030 Italy | |
| 1 of April | Celsus | Saint Celsus | 1129 Ireland | |
| 3 of April | Chrestus | Saint Chrestus of Tomis | Romania | |
| 4 of April | Cayetano | Blessed Gaetano Catanoso | Italy | |
| 5 of April | Catalina | Saint Catalina Tomás | 1574 Spain | |
| 6 of April | Catalina | Blessed Catherine of Pallanza | 1478 Italy | |
| 6 of April | Ceferino | Blessed Zeferino Agostini | 1896 Italy | |
| 7 of April | Calliope | Saint Calliope | Greece | |
| 8 of April | Clemente | Blessed Clemente of Auximo | 1291 Italy | |
| 9 of April | Casilda | Saint Casilda of Toledo | Spain | 1075 Spain |
| 9 of April | Celestina | Blessed Katarzyna Celestyna Faron | Poland | |
| 12 of April | Constantine | Saint Constantine | France | |
| 13 of April | Caradoc | Saint Caradoc | 1124 United kingdom | |
| 15 of April | César | Blessed Cesar of Hus | 1607 France | |
| 15 of April | Crescentius | Saint Crescentius | Italy | |
| 16 of April | Contardo | Saint Contardo of Brona | 1249 Italy | |
| 17 of April | Catalina | Blessed Catherine Tekawitha | Canada | 1680 Canada |
| 17 of April | Clara | Blessed Chiara Gambacorti | Italy | 1419 Italy |
| 20 of April | Clara | Blessed Chiara Bosatta | 1887 Italy | |
| 20 of April | Christophorus | Saint Christophorus | ||
| 21 of April | Conrad | Saint Conrad of Parzham Birndorfer | 1891 Germany | |
| 22 of April | Caius | Saint Caius Pope | 296 Italy | |
| 22 of April | Chrysotelus | Saint Chrysotelus | ||
| 25 of April | Clarence | Saint Clarence | France | |
| 26 of April | Counsel | Our Lady of Good Counsel | ||
| 26 of April | Cleto | Saint Cletus pope | 88 Italy | |
| 27 of April | Catalina | Blessed Ossana of Kotor | 1565 | |
| 28 of April | Caralippus | Saint Caralippus martyr | ||
| 29 of April | Catalina | Saint Catherine of Siena | 1347 Italy | 1380 Italy |
| 1 of May | Clemente | Blessed Clement Septyckyj | 1951 Russian federation | |
| 2 of May | Cyriacus | Saint Cyriacus of Atalia | Turkey | |
| 3 of May | Conleth | Saint Conleth | 520 Ireland | |
| 4 of May | Cyriacus | Saint Cyriacus presbyter and martyr | ||
| 4 of May | Carlos | Blessed Carlos Manuel Rodríguez Santiago | 1918 Puerto Rico | 1963 Puerto Rico |
| 4 of May | Curcodomus | Saint Curcodomus deacon | ||
| 4 of May | Ceferino | Blessed Ceferino Giménez Malla | 1861 Spain | 1936 Spain |
| 5 of May | Crescenciana | Saint Crescenciana mártir | ||
| 5 of May | Catalina | Blessed Catalina Cittadini | 1801 Italy | 1857 Italy |
| 7 of May | Cenérico | Saint Cenericus | France | |
| 10 of May | Catald | Saint Catald of Ireland | Ireland | Italy |
| 10 of May | Calepodius | Saint Calepodius presbyterian | ||
| 10 of May | Comgall | Saint Comgall | Ireland | 622 Ireland |
| 12 of May | Cyril | Saint Cyril of Mesia and martyr companions | Bulgaria | Bulgaria |