Encyclopedias, Almanacs, Transcripts, and Maps
- spatterdock
- Spaulding, C. C.
- Spaulding, Elbridge Gerry
- spaying
- Speaker, Tris
- Special Facilities and Populations
- Special Olympics
- special prosecutor
- spectacle bird
- Spectral Classes for Main Sequence Stars ( (table))
- Spee, Maximilian, Graf von
- speech defect
- Speedway
- speedwell
- Spelman College
- Spence, Michael
- Spencer Gulf
- Spencer, George John Spencer, 2d Earl
- Sperry, Roger Wolcott
- sphenodon