William Wagner
William, Will, Bill, or Billy Wagner may refer to:
Sports
- Bill Wagner (baseball), American baseball catcher
- Billy Wagner, MLB pitcher
- Bull Wagner, pitcher in Major League Baseball
- Will Wagner (American football) American football player and coach
- Will Wagner (baseball), MLB infielder, son of Billy Wagner
- William Wagner (long snapper), American football long snapper
Others
- Bill Wagner (software), American software developer
- Bill Wagner III, Arizona politician
- George "Billy" Wagner III, suspect in the Pike County shootings
- Guillermo Wagner Granizo, American ceramic tile artist
- Kenny Wagner, Mississippi bootlegger
- Stanley Wagner (winemaker), early American vintner
- William Wagner (actor), American character actor
- William Wagner (land surveyor), Polish-born Canadian land surveyor
- William Wagner (philanthropist), American philanthropist and natural history museum founder in Philadelphia
- William Wagner (physician), German American physician and revolutionary
- William G. Wagner, Williams College faculty member and former interim president
- Wolfe Wagner, Irish Anglican clergyman