Encyclopedias, Almanacs, Transcripts, and Maps
- Somaliland
- Somare, Sir Michael Thomas
- somatotropin
- Somers, Sir George
- Somerset, Edmund Beaufort, 2d duke of
- Somerset, Fitzroy James Henry
- Somerset, William Seymour, 2d duke of
- Somme, Battles of the
- Sondrio
- Song Ba
- Song Dong Nai
- song, bird
- Songhua
- Songjiang
- Sonneberg
- Sonnino, Sidney, Barone
- Sonoran Desert National Monument
- Sonsonate
- Soochow
- Sophereth