Encyclopedias, Almanacs, Transcripts, and Maps
- Slash-and-Burn Agriculture
- Slate Writing
- Slater, John (1861-1932)
- Slater, Thomas (ca. 1872)
- Slave Labor
- Slawensik Poltergeist
- Slender Blind Snakes, Thread Snakes, or Worm Snakes: Leptotyphlopidae
- Slim-Fast
- Slim4Life
- Slippery Slope Arguments
- Slit-Faced Bats: Nycteridae
- Sloan, John C. (1870-1951)
- Slocum, John (1842-1897)
- Slomann, Aage (1891-1970)
- Sloths
- Sloths
- Sloths, Anteaters, and Armadillos: Xenarthra
- Slugs
- Slugs
- Smagorad