William Slater
William, Bill, Billy or Willie Slater may refer to:
- William Slater (architect), English architect
- William Slater (cricketer), English cricketer
- William Slater (swimmer), Canadian swimmer
- William Slater (Tennessee politician),, American politician from Tennessee
- William A. Slater, American businessman, art collector, and philanthropist
- Bill Slater (broadcaster), American educator, sports announcer, and radio/television personality
- Bill Slater (footballer), English footballer
- Bill Slater (politician), Australian lawyer, politician and diplomat
- Billy Slater, Australian rugby league footballer
- Billy Slater (footballer), English footballer
- Willie J. Slater, American football coach and player
- Edward Slater, also known as Bill Slater, Australian biochemist