William McCoy or MacCoy may refer to:W. F. McCoy (1886–1976), Speaker of the Northern Ireland House of Commons William McCoy (1877–1948), American rum-runner during Prohibition William McCoy (congressman), American politician and member of Congress William McCoy (mutineer), Scottish mutineer on HMS Bounty William McCoy (1921–1996), American politician and member of the Oregon Legislative Assembly William D. McCoy (1853–1893), American diplomat William F. MacCoy (1840–1914), lawyer and politician in Nova Scotia, Canada William J. McCoy (composer) (1848–1926), American composer William J. McCoy (1942–2019), American politician and Speaker of the Mississippi House of Representatives William John McCoy (1834–1897), American politician and member of the Wisconsin State Assembly Willie McCoy (rapper), rapper Bill McCoy (cricketer) (1906–1980), New Zealand cricketer