| Frederick Fass | |
| Position: | Pitcher |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Date: | 30 October 1859 |
| Birth Place: | Milwaukee, Wisconsin |
| Death Place: | Burnt Mill, Colorado |
| Debutleague: | MLB |
| Debutdate: | July 11 |
| Debutyear: | 1887 |
| Debutteam: | Indianapolis Hoosiers |
| Finalleague: | MLB |
| Finaldate: | July 29 |
| Finalyear: | 1887 |
| Finalteam: | Indianapolis Hoosiers |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 0–1 |
| Stat2label: | Earned run average |
| Stat2value: | 10.34 |
| Stat3label: | Strikeouts |
| Stat3value: | 0 |
| Teams: |
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Frederick Peter Fass (October 30, 1859 – July 5, 1930) was a professional baseball player. He was a pitcher for one season (1887) with the Indianapolis Hoosiers. For his career, he compiled an 0–1 record in four appearances, recording a 10.34 earned run average and no strikeouts.
He died in Burnt Mill, Colorado at the age of 70.