William McDougall, Canadian lawyer and politician, Lieutenant Governor of the Northwest Territories (d. 1905)
William McDougall may refer to:

William McDougall (politician, born 1822) (1822–1905), Canadian lawyer and politician from Ontario

William McDougall (Nova Scotia politician) (1816–1886), Canadian shipbuilder and politician from Nova Scotia

William McDougall (Quebec politician) (1831–1886), Canadian lawyer, judge and politician from Quebec

William McDougall (psychologist) (1871–1938), British psychologist and author

William Currie McDougall (1840-1920) Scottish minister and poet, central to the Coatbridge Free Church Scandal

Bill McDougall (born 1966), Canadian ice hockey player