William McKay (disambiguation)
William McKay was a Canadian soldier and administrator.
William or Bill McKay may also refer to:
- William McKay (footballer), Scottish footballer
- William McKay (parliamentary official), British government administrator, Clerk of the House of Commons
- William McKay (politician), Canadian Senator representing Nova Scotia
- Bill McKay (footballer, born 1906), Scottish association footballer
- Bill McKay (Australian footballer), Australian rules footballer
- Bill McKay (rugby union), Irish rugby union player
- Billy Mckay, Northern Irish footballer
- William Cameron McKay, U.S. Army officer, scout, physician and surgeon
- Bill McKay, fictional politician played by Robert Redford in The Candidate (1972 film)