William Horne
William, Willie, Bill, or Billy Horne may refer to:
Politics
- William Horne British member of parliament and Attorney General for England and Wales
- Bill Horne, Canadian politician
- William C. Horne, Nevada state representative
- William S. Horne, Maryland politician and judge
Sports
- William Horne , English golfer
- William Horne , English football player
- Billy Horne, American baseball player
- Willie Horne, English rugby league player
Others
- Brother William Horne, one of the "Carthusian Martyrs"
- William Kenneth Horne, British colonial judge and speaker
- William Horne , operatic tenor, notably with the New York City Opera