William Smart may refer to:
Sports Turkey Smart (William Smart, 1830–1919), British speed skater Bill Smart (born 1948) Canadian runner
Others William Smart (economist) (1853–1915), Scottish economist William Marshall Smart (1889–1975), Scottish astronomer William Jackson Smart, father of Sonora Smart Dodd Billy Smart Sr. (1894–1966), British circus owner Billy Smart Jr. (1934–2005), British circus performer
See also William Smarte (c. 1530–1599), MP for Ipswich