| Dennis Coughlin | |
| Position: | Outfielder |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Date: | January 1844 |
| Birth Place: | New York City, New York, U.S. |
| Death Date: | May 14, 1913 (aged 69) |
| Death Place: | Washington D.C., U.S. |
| Debutleague: | MLB |
| Debutdate: | April 27 |
| Debutyear: | 1872 |
| Debutteam: | Washington Nationals |
| Finalleague: | MLB |
| Finaldate: | June 26 |
| Finalyear: | 1872 |
| Finalteam: | Washington Nationals |
| Statleague: | MLB |
| Stat1label: | Games played |
| Stat1value: | 8 |
| Stat2label: | Batting average |
| Stat2value: | .297 |
| Stat3label: | Hits |
| Stat3value: | 11 |
| Teams: |
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Dennis F. Coughlin (January 1844 – May 14, 1913) was an American professional baseball player who played as an outfielder during the 1872 season for the Washington Nationals in the National Association.
Coughlin is remembered as the only major leaguer who was wounded in combat in the Civil War. He was a sergeant in Company E, 140th New York Infantry. After his time in baseball, he worked in the U.S. Treasury Department for 45 years.