William Buchanan

William or Bill Buchanan may refer to:
 * William Buchanan (Manitoba politician) (1865–?), Irish-born Canadian Conservative politician
 * William Buchanan (locomotive designer) (1830–1910), designed trains for the New York Central
 * William Buchanan (pastoralist) (1824–1911), Australian pastoralist and gold prospector
 * William Buchanan (footballer) (1911–?), Scottish amateur footballer
 * William Buchanan (art dealer) (1777–1864), British art dealer


 * William Izett Buchanan (born 1972), American expatriate basketball player
 * William I. Buchanan (1853–1909), American diplomat
 * William Ashbury Buchanan (1876–1954), journalist, publisher and politician based in Alberta
 * William Murdoch Buchanan (1897–1966), Canadian politician and dentist
 * Bill Buchanan (24), a fictional character in 24
 * Bill Buchanan (computer scientist) (born 1961), Scottish computer scientist
 * Bill Buchanan (songwriter) (1930–1996), American songwriter
 * Billy Buchanan (1924–1999), Scottish footballer with Carlisle United and Barrow