S
- Sam Allen (d. 1946), long serving servant of Swindon Town Footbal Club
- Sam Allen (musician) (1909–1963), American jazz pianist
- Samuel Clesson Allen (1772–1842), American politician from Massachusetts
- Sarah Allen
- Sheila Allen (born 1929), American actress
- Sheila Allen (English actress) (born 1932), English actress
- Shirley Allen, American nurse involved in 1997 "siege"
- Stephen Allen, (1767–1852), Mayor of New York
- Steve Allen, several people
- Sture Allén (born 1928), Swedish academic
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