John Happenny
- Given Name
- John Clifford
- Nickname(s)
- Cliff
- Born
- 5/18/1901 — Waltham, MA, USA
- Died
- 12/29/1988 — Coral Springs, FL, USA
- Weight
- 165 lbs
- Height
- 5' 11"
- Throws
- R
- Bats
- R
- Team(s)
- Chicago White Sox (1923)
- Debut
- 1923-07-02
- Final Game
- 1923-10-06