John Cahill
- Given Name
- John Patrick Parnell
- Nickname(s)
- Patsy
- Born
- 4/30/1865 — San Francisco, CA, USA
- Died
- 10/31/1901 — Pleasanton, CA, USA
- Weight
- 168 lbs
- Height
- 5' 7"
- Throws
- R
- Bats
- R
- Team(s)
- Columbus Buckeyes (1884)St. Louis Maroons (1886)Indianapolis Hoosiers (1887)
- Debut
- 1884-05-31
- Final Game
- 1887-08-09