William Still (1821–1902) was an abolitionist and member of the Pennsylvania Anti-Slavery Society.
William Still may also refer to:
William Grant Still (1895–1978), American composer William Joseph Still (1870–????), English engineer William N. Still Jr. (1932–2023), American maritime historian William Still (cricketer) (c. 1820–1910), Australian cricketer Will Still (born 1992), Belgian professional football manager