| Fred Koster | |
| Position: | Outfielder |
| Bats: | Left |
| Throws: | Left |
| Birth Date: | 21 December 1905 |
| Birth Place: | Louisville, Kentucky |
| Death Place: | St. Matthews, Kentucky |
| Debutleague: | MLB |
| Debutdate: | April 27 |
| Debutteam: | Philadelphia Phillies |
| Finalleague: | MLB |
| Finaldate: | September 27 |
| Finalteam: | Philadelphia Phillies |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .225 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 8 |
| Teams: |
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Frederick Charles Koster ["Fritz"] (December 21, 1905 – April 24, 1979) was an outfielder in Major League Baseball who played for the Philadelphia Phillies during the season.
Koster attended the University of Louisville, where he played college baseball for the Cardinals from 1926 to 1928.[1]