Lefty Johnson
- Given Name
- William F.
- Nickname(s)
- Sleepy Bill, Lefty
- Born
- 9/28/1861 — NJ, USA
- Died
- 7/17/1942 — Chester, PA, USA
- Weight
- 167 lbs
- Throws
- L
- Bats
- L
- Team(s)
- Philadelphia Keystones (1884)Indianapolis Hoosiers (1887)Baltimore Orioles (1890–1892)
- Debut
- 1884-06-27
- Final Game
- 1892-04-27