Encyclopedias, Almanacs, Transcripts, and Maps
- Seabrook, Charles Courtney
- Seaga, Edward (1930–)
- Seale, Robert George ("Bobby")
- Searle, John (1932–)
- Searle, John Gideon ("Jack")
- SEASPEAK
- Seaver, George Thomas ("Tom")
- Seaver, George Thomas ("Tom")
- Sebastian (Sebastião) of Portugal (1554–1578)
- Sebastianismo
- Sechín Alto
- Second Order Logic
- Sedang
- Sedeño, Antonio de (?–1539)
- Sediq, Sohaila
- Seeger, Peter R. ("Pete")
- Segall, Lasar (1891–1957)
- Seguín, Juan José María Erasmo (1782–1857)
- Seguín, Juan Nepomuceno (1806–1890)
- Seibal