| John Karst | |
| Bats: | Left |
| Throws: | Right |
| Birth Date: | 15 October 1893 |
| Birth Place: | Philadelphia |
| Death Place: | Cape May Court House, New Jersey |
| Debutleague: | MLB |
| Debutdate: | October 6 |
| Debutyear: | 1915 |
| Debutteam: | Brooklyn Robins |
| Finalleague: | MLB |
| Finaldate: | October 6 |
| Finalyear: | 1915 |
| Finalteam: | Brooklyn Robins |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .000 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 0 |
| Teams: |
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John Gottlieb Karst (October 15, 1893 in Philadelphia – May 21, 1976 in Cape May Court House, New Jersey), was a professional baseball player who played third base in one game for the 1915 Brooklyn Robins. He attended the University of Pennsylvania.