Bill Hollahan
- Given Name
- William James
- Nickname(s)
- Happy
- Born
- 11/22/1896 — New York, NY, USA
- Died
- 11/27/1965 — New York, NY, USA
- Weight
- 165 lbs
- Height
- 5' 8"
- Throws
- R
- Bats
- R
- Team(s)
- Washington Senators (1920)
- Debut
- 1920-09-27
- Final Game
- 1920-10-03