| Tom Gillen | |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Date: | May 18, 1862 |
| Birth Place: | Philadelphia, Pennsylvania |
| Death Place: | Philadelphia, Pennsylvania |
| Debutleague: | MLB |
| Debutdate: | April 18 |
| Debutyear: | 1884 |
| Debutteam: | Philadelphia Keystones |
| Finalleague: | MLB |
| Finaldate: | September 15 |
| Finalyear: | 1886 |
| Finalteam: | Detroit Wolverines |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .175 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 4 |
| Teams: |
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Thomas J. Gillen (May 18, 1862 – January 26, 1889) was a 19th-century Major League Baseball player. He played primarily catcher during the 1884 season for the Philadelphia Keystones of the Union Association and during the 1886 season for the Detroit Wolverines of the National League.