William Ross, Baron Ross of Marnock (1911–1988), Secretary of State for Scotland in the 1960s
William Ross (Canadian politician) (1824–1912), merchant, ship builder and politician in Nova Scotia, Canada
William Cecil Ross (1911–1998), leader of the (communist) Labour Progressive Party of Manitoba in 1945
William Gladstone Ross (1889–1948), lawyer, judge and politician in Saskatchewan, Canada
William Ross (Unionist politician) (born 1936), Ulster Unionist Party member of Parliament until 2001
William Ross (speaker), New York politician, Speaker of the State Assembly 1814
William Ross (Ontario politician) (1854–1937), merchant and politician in Ontario, Canada
William B. Ross (1873–1924), Governor of Wyoming
William Benjamin Ross (1855–1929), Canadian politician, lawyer and businessman
William Cecil Ross (1911–1998), politician in Manitoba, Canada, and the leader of that province's Communist Party
William Donald Ross (1869–1947), financier, banker and Lieutenant Governor of Ontario
William H. H. Ross (1814–1887), American politician and former governor of Delaware
William Roderick Ross (1869–1928), lawyer and politician in British Columbia, Canada
Bill Ross (Australian politician) (1888–1966), member of the New South Wales Legislative Assembly
William Henry Ross, provincial level politician from Alberta, Canada

Sports

William Ross (cricketer), Australian cricketer
William Ross (footballer), English professional footballer active in the 1890s
William Ross (rower) (born 1900), Canadian Olympic rower
William Ross (water polo) (born 1928), US water polo player who competed in the 1956 Summer Olympics
William Alexander Ross (1913–1942), Scottish rugby player

Nobility

William I of Ross, anglicized form of Uilleam I, Earl of Ross
William II of Ross, anglicized form of Uilleam II, Earl of Ross
William Ross, 8th Lord Ross (died 1640), Scottish nobleman
William Ross, 10th Lord Ross (died 1656), Scottish nobleman
William Ross, 12th Lord Ross (died 1738), Scottish nobleman, soldier and politician
William Ross, 14th Lord Ross (died 1754), Scottish nobleman

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Lists

William Ross is in following lists