William Smart

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