| Henry Mullin | |
| Position: | Outfielder |
| Bats: | Right |
| Throws: | Unknown |
| Birth Date: | April 17, 1862 |
| Birth Place: | Saint John, New Brunswick, British North America |
| Death Place: | Beverly, Massachusetts, U.S. |
| Debutleague: | MLB |
| Debutdate: | June 4 |
| Debutyear: | 1884 |
| Debutteam: | Washington Nationals |
| Finalleague: | MLB |
| Finaldate: | September 24 |
| Finalyear: | 1884 |
| Finalteam: | Boston Reds |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .133 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 0 |
| Teams: |
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Henry J. Mullin (1862–1937) was a Major League Baseball outfielder. He played for the 1884 Washington Nationals in the American Association and Boston Reds in the Union Association. He played in the New England League in 1885–1886.