William Slater

William, Bill, Billy or Willie Slater may refer to:
 * William Slater (architect) (1819–1872), English architect
 * William Slater (cricketer) (1790–1852), English cricketer
 * William Slater (swimmer) (born 1940), Canadian swimmer
 * William A. Slater (1857–1919), American businessman, art collector, and philanthropist
 * Bill Slater (broadcaster) (1902–1965), American educator, sports announcer, and radio/television personality
 * Bill Slater (footballer) (1927–2018), English footballer
 * Bill Slater (politician) (1890–1960), Australian lawyer, politician and diplomat
 * Billy Slater (born 1983), Australian rugby league footballer
 * Billy Slater (footballer) (1858–?), English footballer
 * Willie J. Slater, American football coach and player
 * Edward Slater (1917–2016), also known as Bill Slater, Australian biochemist