| Sabas Reyes Slazar, Priest, Cristero Martyr |
| Sabas the Youth |
| Sabas, Abbot |
| Sabina of Rome, Matron and Martyr |
| Sabina of Talavera, Martyr, Sister of Sts. Cristeta and Vincent of Avila |
| Sabinianus, Martyr of Cordoba |
| Sabinus (Abibus), of Egypt, Procurator of Hermopolis, Martyr |
| Sabinus, Bishop of Assisi, Martyred in Spoleto |
| Sacerdos, Bishop of Lyon |
| Sadoth (Sadoc), Metropolitan of Celeucia/Ctesiphon, Martyred by the Persians |
| Salomea, Queen, Matron, Abbess of the Poor Clares at Zawichost (later moved to Skala) |
| Salonius, Bishop of Geneva |
| Salustianus of Sardinia, Martyr |
| Salvador Huerta Gutierrez, Mexican Layman, Cristero Martyr |
| Salvador Lara Puente, Mexican Layman, Cristero Martyr |
| Salvador, Martyr |
| Salvator of Horta, Spanish Franciscan Brother |
| Salvinus, Bishop of Maçon |
| Salvius, Bishop of Alvi |
| Samonas of Edessa, Martyr |
| Samson, 1st Bishop of Dol, Brittany |
| Sancja (Janina) Szymkowiak, Polish Daughter of the Sorrowful Mother |
| Santinus, Bishop of Verdun |
| Sara of Antioch, Mother, Martyred with her two sons |
| Sara the Black, Patroness of the Romani (Gypsy) people |
| Sara, Egyptian Virgin and Ascetic |
| Saturninus of Carthage, Martyr, One of the Companions of Perpetua and Felicitas |
| Saturninus, Bishop of Verona |
| Saturninus, Carthiginian Priest, Martyred in Rome |
| Saturnus, Vandal Companion of St. Armogastes, Martyr |
| Savinus (Sabinus), Bishop of Conosa, Martyr |
| Scholastica, Foundress of the Benedictine Sisters |
| Sebastian Maggi, Dominican Priest, Reformer |
| Sebastian, Soldier and Martyr |
| Sebbe (Sebba, Sebbi) King of the East Angles, Benedictine Monk |
| Secunda. Virgin and Martyr |
| Secundinus (Sechnall), Irish Bishop, Nephew of St. Patrick |
| Secundinus, Bishop of Palestrina |
| Secundinus, Martyr |
| Secundus, Martyr |
| Secundus, Priest, Martyred at Barca, near Alexandria |
| Senan of Inis Cathaigh (Scattery Island) Irish Abbot/Bishop |
| Senator, Bishop of Milan |
| Sennen, Martyr |
| Serafina of Galicia, early convert |
| Seraphim of Sarov, Russian monk and mystic |
| Seraphina (Fina) of St. Gemignano |
| Seraphino of Ascoli, Capuchin Priest |
| Seraphinus of Montegrano, Capuchin Lay Brother |
| Serapia, Virgin and Martyr |
| Serapion, Bishop of Thmuis, Egypt, “the Scholastic,” head of the Catechetical School of Alexandria |
| Serapion, Martyr |
| Serapion, Patriarch of Antioch |
| Serena of Spoleto, Virgin and Martyr |
| Serenus of Sirmium, Martyr |
| Serenus, Disciple of Origen, companion of Plutarch, Martyr |
| Sergius I, Pope |
| Sergius of Caesarea in Cappadocia, Martyr |
| Sergius of Radonzeh, Father of Russian Monasticism, Abbot of Holy Trinity Monastery |
| Sergius of Ravenna, Martyr |
| Sergius, Soldier and Martyr, Companion of St. Bacchus |
| Serrano (Serranus), Bishop of Oviedo |
| Servanus (Serf), Apostle to the Orkneys |
| Servatius, 1st Bishop of Tongern and Maastricht |
| Servulus of Trieste, Martyr |
| Seven Apostolic Men: Clerics ordained in Rome and sent to convert Spain |
| Caecilius (Elvira/Granada) |
| Ctesiphon (Berja) |
| Euphrasius (Andujar) |
| Hesychius (Cazorla) |
| Indalecius (Pechina) |
| Secundus (Avila) |
| Torquatus (Guadix) |
| Seven Holy Sleepers of Ephesus, Martyrs |
| Constantine |
| Dionysius |
| Johannes |
| Malchus |
| Martinian |
| Maximian |
| Serapion |
| Severianus, Martyr |
| Severinus |
| Severinus of Norica, Martyr |
| Severinus, Bishop of Septempeda (now San Severino) |
| Severinus, Bishop, either of Bordeaux or Cologne |
| Severus, Bishop of Barcelona, Martyr |
| Severus, Bishop of Catania, Sicily |
| Severus, Bishop of Ravenna |
| Sibilbald, Bishop of Metz |
| Sibyllina Biscossi of Pavia, Dominican Tertiary |
| Sidonius, Roman, Martyred under Aurelian, enshrined in Flanders |
| Sigebald, Bishop of Metz |
| Sigebert I, King of East Anglia |
| Sigfried, Bishop of Sweden (baptized St. Olaf) |
| Sigismund, King of Burgundy, Martyr |
| Silvanus (Silas), Disciple of St. Paul |
| Silvanus, Bishop of Gaza |
| Silvanus, Martyred in Alexandria |
| Silverius, Pope |
| Silvester Guzzolini, Abbot, Founder if the Silvestrine Benedictines |
| Silvester I, Pope |
| Silvius, Bishop of Toulouse |
| Simeon Cardon and 5 Companions, Cistercian Martyrs of Casamari |
| Simeon Cardon and 5 Companions, Cistercian Martyrs of Casamari |
| Simeon Cardon and 5 Companions, Cistercian Martyrs of Casamari |
| Simeon Cardon and 5 Companions, Cistercian Martyrs of Casamari |
| Simeon Cardon and 5 Companions, Cistercian Martyrs of Casamari |
| Simeon Cardon and 5 Companions, Cistercian Martyrs of Casamari |
| Simeon Stylites |
| Simeon the God-Receiver of Jerusalem |
| Simeon, Second Bishop of Jerusalem and Cousin of Our Lord |
| Simon Mchajlovic of Volom, Russian Priest, Martyr |
| Simon Miguel Rodriguez, Franciscan Brother, Martyr |
| Simon Stock, Carmelite Priest, Superior General of the Order |
| Simon the Apostle |
| Simplicianus, Bishop of Milan, Successor of St. Ambrose, Friend of St. Augustine |
| Simplicius |
| Simplicius, Martyr |
| Simplicius, Pope |
| Sirus (Horus), Bishop, Martyred in Alexandria |
| Sisebuto, Abbot of Cardena |
| Sisinius, Martyr |
| Sisto Riario Sforza, Cardinal Archbishop of Naples |
| Sixtus I, Bishop of Rheims |
| Sixtus I, Pope and Martyr |
| Sixtus II, Pope and Martyr |
| Sixtus III, Pope |
| Solange of Bourges, Virgin and Martyr |
| Solanus Casey, Franciscan Priest from Detroit |
| Solemnius, Bishop of Chartres |
| Solomon, Portuguese, martyred in Cordoba |
| Solutor, Martyr, Patron of Turin |
| Sophia, Martyr |
| Sophia, Roman Virgin, Martyr |
| Sophia, Widow, Martyr, and her daughter Martyrs: |
| Faith |
| Hope |
| Charity |
| Sophia (Soilomonia Jurievn Saburova) of Suzdal, Princess of Moscow |
| Sophronius, Patriarch of Jerusalem |
| Soprata, Virgin, Daughter of Byzantine Emperor Maurice |
| Sosipater of Iconium, associate of St. Paul, 1st Bishop of Iconium |
| Sosthenes, disciple of St. Paul |
| Sosthenes Sostegni, One of the Seven Holy Founders of the Servite Order |
| Soter, Pope and Martyr |
| Sotera, Martyr |
| Soteria, Great-Grandmother of St. Ambrose of Milan |
| Sotiro (Zuwarda), Virgin, Martyred in Dordrecht, Holland |
| Speciosa of Antioch, Virgin and Martyr |
| Speranza di Gesu (Giuseppa Alhama Valera), foundress of the Handmaids of Merciful Love |
| Stanislaus Kostka, Jesuit Novice |
| Stanislaus, Bishop of Cracow and Martyr |
| Stanley Rother, missionary Priest from Oklahoma, martyred in Guatemala |
| Stephania, Coptic Martyr |
| Stephen (Istvan), King of Hungary |
| Stephen Bandelli, Dominican Priest |
| Stephen Harding, One of the Three Co-founders of the Cistercians |
| Stephen I, Pope and Martyr |
| Stephen of Grandmont, Founder of the extinguished Order of Grandmont |
| Stephen of Obazine, French Hermit, Founding Abbot of Obazine Cistercian Abbey |
| Stephen Pongracz, Hungarian Jesuit Priest, martyred in Košice, Slovakia |
| Stephen the First Martyr, Deacon |
| Stephen, Bishop of Chantillon |
| Successus, Martyr |
| Sulpice (Sulpitius I) Bishop of Bourges |
| Sulpice (Sulpitius II), Archbishop of Bourges |
| Sulpicius Severus, author of The Life of St. Martin of Tours |
| Surano, Abbot, Martyr |
| Susanna of Rome, Virgin and Martyr |
| Swibert, Bishop of Northumbria |
| Swithun, Bishop of Winchester |
| Syagrius, Bishop of Nice |
| Sylvanus |
| Sylvester, Pope |
| Sylvia, Widow (Mother of St. Gregory the Great) |
| Symmachus, Pope |
| Symmetrius of Rome, Priest and Martyr |
| Symphorian, Senator and Martyr |
| Symphorosa of Tivoli, Widow, Martyred with her Sons |
| Synesius of Rome, Lector and Martyr |
| Synphonianus, of Autun, Martyr |
| Syrus, Bishop of Genoa |
| Syrus, Bishop of Pavia |
