Suda - Telm
- Sudan
- Sudan, Vicariate Apostolic of
- Sufetula
- Suffr.
- Sugar, Venerable John
- Suger
- Suicide
- Suidas
- Suitbert Baeumer
- Suitbert, Saint
- Sullivan, Alexander Martin
- Sullivan, Peter John
- Sully, Maurice de
- Sulpicians in the United States
- Sulpicius Severus
- Sulpitius
- Sumatra
- Summae
- Summer Schools, Catholic
- Summæ
- Sunday
- Superior
- Superior, Wisconsin
- Supernatural Adoption
- Supernatural Gift
- Supernatural Order
- Superstition
- Supper, The Last
- Supplioni.
- Suppression of English Monasteries Under Henry VIII
- Suppression of Monasteries in Continental Europe
- Suppression of Monasteries in England
- Suppression of Monasteries in Europe
- Supremi Disciplinae
- Supremi disciplinæ
- Sura
- Surin, Jean-Joseph
- Surius, Laurentius
- Surnames of Famous Doctors
- Surplice