William Klein
Bill, Will, Willy, Willie or William Klein may refer to:
- William Klein , American-French photojournalist and filmmaker
- Will Klein , American professional baseball player
- Willie Klein, American champion golfer
- Willy Klein, Luxembourgish Olympic gymnast in 1936
- Bill Klein , American high-stakes poker champion
- Bill Klein, American football end in 1950 NFL draft
- Bill Klein, American businessman on 2009 TV reality series ''The Little Couple''