Ralph Caldwell
- Given Name
- Ralph Grant
- Nickname(s)
- Lefty
- Born
- 1/18/1884 — Philadelphia, PA, USA
- Died
- 8/5/1969 — West Trenton, NJ, USA
- Weight
- 155 lbs
- Height
- 5' 9"
- Throws
- L
- Bats
- L
- Team(s)
- Philadelphia Phillies (1904–1905)
- Debut
- 1904-09-10
- Final Game
- 1905-07-05