Jack Onslow
- Given Name
- John James
- Nickname(s)
- Tiger Jack
- Born
- 10/13/1888 — Scottdale, PA, USA
- Died
- 12/22/1960 — Concord, MA, USA
- Weight
- 180 lbs
- Height
- 5' 11"
- Throws
- R
- Bats
- R
- Team(s)
- Detroit Tigers (1912)New York Giants (1917)
- Debut
- 1912-05-02
- Final Game
- 1917-10-03