Jack Pfiester
- Given Name
- John Albert
- Nickname(s)
- Jack The Giant Killer
- Born
- 5/24/1878 — Cincinnati, OH, USA
- Died
- 9/3/1953 — Loveland, OH, USA
- Weight
- 180 lbs
- Height
- 5' 11"
- Throws
- L
- Bats
- R
- Team(s)
- Pittsburgh Pirates (1903–1904)Chicago Cubs (1906–1911)
- Debut
- 1903-09-08
- Final Game
- 1911-05-10
- Gravesite
- Find-a-Grave