| Frank Decker | |
| Position: | Utility player |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | February 26, 1856 |
| Birth Place: | St. Louis, Missouri |
| Death Place: | St. Louis, Missouri |
| Debutleague: | MLB |
| Debutdate: | June 25 |
| Debutteam: | Syracuse Stars |
| Finalleague: | MLB |
| Finaldate: | August 24 |
| Finalteam: | St. Louis Brown Stockings |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .167 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 1 |
| Teams: |
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Frank Decker (February 26, 1856 in St. Louis, Missouri - February 5, 1940 in St. Louis) was a 19th-century professional baseball player. Decker played in 3 games for the Syracuse Stars in 1879 and 2 games for the St. Louis Brown Stockings in 1882.