| John Siegel | |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Date: | 1861 |
| Birth Place: | Philadelphia, Pennsylvania, U.S. |
| Death Date: | June 6, 1916 |
| Death Place: | Philadelphia, Pennsylvania, U.S. |
| Debutleague: | MLB |
| Debutdate: | June 9 |
| Debutyear: | 1884 |
| Debutteam: | Philadelphia Keystones |
| Finalleague: | MLB |
| Finaldate: | June 24 |
| Finalyear: | 1884 |
| Finalteam: | Philadelphia Keystones |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .226 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 0 |
| Teams: |
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Frederick Siegel (1861 - June 6, 1916) was a 19th-century American Major League Baseball player. He played shortstop during the 1884 season for the Philadelphia Keystones of the Union Association. He appeared in eight games for the Keystones in June 1884 and had seven hits in 31 at-bats.