| Jack Gilbert | |
| Position: | First baseman |
| Birth Date: | September 4, 1875 |
| Birth Place: | Rhinecliff, New York |
| Death Place: | Albany, New York |
| Debutleague: | MLB |
| Debutdate: | September 11 |
| Debutteam: | Washington Senators |
| Finalleague: | MLB |
| Finaldate: | October 9 |
| Finalteam: | Pittsburgh Pirates |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .240 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 4 |
| Teams: |
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John Robert Gilbert [''Jackrabbit'' ] (September 4, 1875 – July 7, 1941) was a backup outfielder in Major League Baseball who played between and for the Washington Senators (1898), New York Giants (1898) and Pittsburgh Pirates (1904). He was born in Rhinecliff, New York. Batting side and throwing arm are unknown. In a two-season career, Gilbert was a .240 hitter (23-for-96) with 13 runs and four RBI in 28 games, including five stolen bases and a .354 on-base percentage.
Gilbert died in Albany, New York at the age of 65.