Encyclopedias, Almanacs, Transcripts, and Maps
- Sword of the Spirit
- Sykes, Edmund, Bl.
- Sykes, Sir Mark°
- Sykes-Picot Agreement
- Syllabus of Errors
- Sylvester I, Pope, St.
- Sylvester II, Pope
- Sylvester III, Pope
- Sylvester IV, Antipope
- Sylvia, Sarah
- Sylvius, Francis (du Bois)
- Symbol in Revelation
- Symbolism, Early Christian
- Symbolism, Theological
- Symeon the New Theologian, Monk of the Studion
- Symmachus ben Joseph
- Symmachus, Pope, St.
- Symmachus, Quintus Aurelius
- Symonds, Saul
- Symons, Julian