Elmer Koestner

{{Short description|American baseball player (1885–1959)}}

{{Use mdy dates|date=July 2024}}

{{Infobox baseball biography

|name=Elmer Koestner

|position=Pitcher

|image= Elmer Koestner.jpeg

|caption=

|birth_date={{Birth date|1885|11|30}}

|birth_place=Piper City, Illinois, U.S.

|death_date={{death date and age|1959|10|27|1885|11|30}}

|death_place=Fairbury, Illinois, U.S.

|bats=Right

|throws=Right

|debutleague = MLB

|debutdate=April 23

|debutyear=1910

|debutteam=Cleveland Naps

|finalleague = MLB

|finaldate=July 1

|finalyear=1914

|finalteam=Cincinnati Reds

|statleague = MLB

|stat1label=Pitching Record

|stat2label=Earned run average

|stat3label=Strikeouts

|stat1value=5-10

|stat2value=3.18

|stat3value=56

|teams=

• Cleveland Naps (1910)
• Chicago Cubs (1914)
• Cincinnati Reds (1914)

}}

Elmer Joseph Koestner (November 30, 1885 – October 27, 1959) was a Major League Baseball pitcher who played for two seasons. He played for the Cleveland Naps in 1910 and the Chicago Cubs and Cincinnati Reds in 1914.