| Celebration | Name | Saint | Birth | Death |
|---|---|---|---|---|
| 2 of January | Silvestre | Saint Silvestre | Italy | |
| 5 of January | Simeón | Saint Simeon the Stylite | Syrian arab republic | Syrian arab republic |
| 5 of January | Sinclética | Saint Sinclética | Egypt | |
| 8 of January | Severino | Saint Severino abad | 482 Germany | |
| 11 of January | Salvio | Saint Salvio | ||
| 15 of January | Secundina | Saint Secundina | Italy | |
| 17 of January | Sulpicio | Saint Sulpicio Pío | 647 France | |
| 20 of January | Sebastián | Saint Sebastian | 256 France | 288 Italy |
| 20 of January | Stephen | Saint Stephen Min Kuk-ka | 1840 Korea, republic of | |
| 23 of January | Severiano | Saint Severiano, mártir | Algeria | |
| 24 of January | Sabiniano | Saint Sabiniano | France | |
| 29 of January | Sarbelio | Saint Sarbelio, presbítero | Turkey | |
| 29 of January | Serrano | Saint Serrano o Serano | ||
| 29 of January | Sulpicio | Saint Sulpicio Severo | 591 France | |
| 30 of January | Sebastian | Blessed Sebastian Valfre | 1710 Italy | |
| 1 of February | Severo | Saint Severo, obispo of Rávena | 342 Italy | |
| 1 of February | Sigeberto | Saint Sigeberto | 656 France | |
| 2 of February | Simon | Blessed Simon of Cassia Fidati | 1348 Italy | |
| 5 of February | Sabas | Saint Sabas el Joven | 995 Italy | |
| 6 of February | Silvano | Saint Silvano, obispo | 238 Syrian arab republic | |
| 8 of February | Stephen | Saint Stephen of Grandmont | 1046 | 1124 France |
| 9 of February | Sabino | Saint Sabino, obispo | 566 | |
| 11 of February | Severino | Saint Severino, abad of Agaun | France | |
| 11 of February | Secundino | Saint Secundino | ||
| 11 of February | Soteris | Saint Soteris | 304 Italy | |
| 12 of February | Saturnino | Saint Saturnino y compañeros mártires of Abitinia | 304 Tunisia | |
| 13 of February | Stephen | Saint Stephen of Rieti | Italy | |
| 13 of February | Stephen | Saint Stephen of Lyon | 515 France | |
| 15 of February | Sigfrido | Saint Sigfrido | United kingdom | 1045 Sweden |
| 15 of February | Severo | Saint Severo of Valeria | Italy | |
| 17 of February | Silvino | Saint Silvino of Auchy | France | |
| 17 of February | Siervos de María | The seven saints founders of the Order of the servants of Mary | ||
| 18 of February | Sadoth | Saint Sadoth y compañeros | 342 Syrian arab republic | |
| 20 of February | Serapión | Saint Serapión of Alejandría | 248 Egypt | |
| 23 of February | Sireno | Saint Sireno | 307 Italy | |
| 24 of February | Sergio | Saint Sergius of Cappadocia | Turkey | |
| 25 of February | Sebastian | Blessed Sebastian Aparicio | 1502 Spain | 1600 Mexico |
| 1 of March | Siviardo | Saint Siviardo | 680 France | |
| 1 of March | Suitberto | Saint Suitberto | Germany | 713 Germany |
| 2 of March | Simplicio | Saint Simplicius Pope | Italy | 483 Italy |
| 3 of March | Samuel | Blessed Samuel Marzorati | 1716 Ethiopia | |
| 8 of March | Senano | Saint Senano | Ireland | |
| 8 of March | Stephen | Saint Stephen of Obazina | 1159 France | |
| 11 of March | Sofronio | Saint Sofronio of Jerusalén | 639 Israel | |
| 13 of March | Sabino | Saint Sabino of Egipto | ||
| 15 of March | Sisebuto | Saint Sisebuto | 1086 Spain | |
| 18 of March | Salvador | Saint Salvador of Horta Grionesos | 1567 Italy | |
| 19 of March | Sibilina | Blessed Sibyllina Biscossi | 1367 Italy | |
| 21 of March | Serapión | Saint Serapión el Escolástico | Egypt | Egypt |
| 24 of March | Secúndulo | Saint Secúndulo of Mauritania | Mauritania | |
| 24 of March | Severo | Saint Severo of Catania | 814 Italy | |
| 28 of March | Sixtus | Saint Sixtus III, pope | United kingdom | 440 Italy |
| 28 of March | Stephen | Saint Stephen Harding | 1134 France | |
| 29 of March | Saturno | Saint Saturno, mártir | 462 | |
| 30 of March | Segundo | Saint Segundo of Asti | Italy | |
| 3 of April | Sixto | Saint Sixto I papa | 128 Italy | |
| 11 of April | Sancha | Blessed Sancha | 1229 Portugal | |
| 11 of April | Symforian | Blessed Symforian Ducki | Poland | |
| 12 of April | Sofía | Saint Sofía of Fermo | Italy | |
| 12 of April | Sabas | Saint Sabas Godo | 372 Turkey | |
| 13 of April | Sabás | Saint Sabás Reyes | 1883 Mexico | 1927 Mexico |
| 18 of April | Sabina | Blessed Sabina Petrilli | 1923 Italy | |
| 20 of April | Secundino | Saint Secundino of Córdoba | Spain | |
| 20 of April | Simon | Blessed Simon of Todi Rinalducci | 1322 Italy | |
| 22 of April | Sotero | Saint Soter Pope | Italy | 175 Italy |
| 22 of April | Senorina | Saint Senorina | 980 Portugal | |
| 24 of April | Salomé | Saint Salomé | Israel | Israel |
| 25 of April | Stephen | Saint Stephen of Antioch | 479 Syrian arab republic | |
| 26 of April | Stephen | Saint Stephen of Moscow | 1396 Russian federation | |
| 27 of April | Simeón | Saint Simeón | 107 Israel | |
| 29 of April | Severo | Saint Severo of Nápoles | 409 Italy | |
| 1 of May | Segismundo | Saint Segismundo | Switzerland | 524 France |
| 3 of May | Santiago | James the Less, apostle | Israel | |
| 4 of May | Silvano | Saint Silvano of Gaza y compañeros mártires | 304 Israel | |
| 5 of May | Sacerdote | Saint Sacerdote of Limoges | France | |
| 10 of May | Solangia | Saint Solangia | France | |
| 13 of May | Servacio | Saint Servacio of Tongres | Armenia | 384 Belgium |
| 15 of May | Simplicio | Saint Simplicio of Cerdeña | France | |
| 15 of May | Severino | Saint Severino of Septempeda | Italy | |
| 16 of May | Simón | Saint Simon Stock | 1165 United kingdom | 1265 France |
| 23 of May | Siagrio | Saint Siagrio | 787 Italy | |
| 23 of May | Spes | Saint Spes of Nursia | 517 Italy | |
| 24 of May | Sérvulo | Saint Sérvulo of Trieste | Italy | |
| 24 of May | Simeón | Saint Simeón Estilita el Joven | 521 Syrian arab republic | 597 Syrian arab republic |
| 26 of May | Simetrio | Saint Simetrio of Roma | Italy | |
| 29 of May | Senador | Saint Senador of Milán | 480 Italy | |
| 30 of May | Sico | Saint Sico mártir | ||
| 31 of May | Silvio | Saint Silvio of Toulouse | France | |
| 1 of June | Simeón | Saint Simeón of Tréveris | Italy | 1035 Italy |
| 5 of June | Sancho | Blessed Sancho of Córdoba | France | 851 Spain |
| 8 of June | Saviano | Saint Sabiniano abad | ||
| 8 of June | Salustiano | Saint Salustiano | ||
| 16 of June | Similiano | Saint Similiano of Nantes | France | |
| 24 of June | Simplicio | Saint Simplicio of Autun | 375 France | |
| 25 of June | Salomón | Saint Salomón of Bretaña | France | 874 France |
| 25 of June | Sosípatro | Saint Sosíprato | ||
| 26 of June | Superio | Saint Superio mártir | ||
| 26 of June | Salvio | Saint Salvio y compañero | France | France |
| 27 of June | Sansón | Saint Saintsón of Constantinopla | 560 Turkey | |
| 29 of June | Siro | Saint Siro | 330 Italy |