Elmer Koestner
- Given Name
- Elmer Joseph
- Nickname(s)
- Bob
- Born
- 11/30/1885 — Piper City, IL, USA
- Died
- 10/27/1959 — Fairbury, IL, USA
- Weight
- 175 lbs
- Height
- 6' 1"
- Throws
- R
- Bats
- R
- Team(s)
- Cleveland Naps (1910)Cincinnati Reds (1914)Chicago Cubs (1914)
- Debut
- 1910-04-23
- Final Game
- 1914-07-01