William Hays (and the nicknames Bill Hays and Will Hays) may refer to:
- William Hays (general), American Civil War Union general
- Will H. Hays, Movie censor
- William Hercules Hays (1820–1880), U.S. federal judge
- William Shakespeare Hays, American poet and lyricist
- Bill Hays (director), British director of stage and television