Encyclopedias, Almanacs, Transcripts, and Maps
- Space Telescopes
- Spade-Headed Wormlizards: Trogonophidae
- Spadefoot Toads: Pelobatidae
- Spangler, David (1945-)
- Spanish Exploration and Colonization
- Spanish Florida and the Founding of St. Augustine
- Spare, Austin Osman (1886-1956)
- Sparks and Lightning: Electrical Theories from the "Electrician" Dufay to the Scientist Coulomb
- Sparrows and Buntings
- Sparrows and Buntings
- Sparrows: Passeridae
- Spastic cerebral palsy
- Spastic Cerebral Palsy
- Speal Bone (Divination by)
- Spear of Destiny
- Spear, John Murray (ca. 1804-1887)
- Specht, Walter
- Specialist Knowledge Services (SKS)
- Species List by Biome
- Species List by Geographic Range