William Lake may refer to:
People William A. Lake (1808–1861), U.S. Representative from Mississippi William Lake (Dean of Durham) (1817–1895), English cleric and college head William Lake (Dean of Antigua) (1947–2003) Bill Lake, Canadian actor Anthony Lake (William Anthony Kirsopp Lake, born 1939), U.S. government official
Places William Lake (Québec), a lake on the Bécancour River in Centre-du-Québec, Quebec, Canada William Lake Provincial Park, provincial park in Manitoba