| Hal O'Hagan | |
| Position: | First baseman |
| Bats: | Unknown |
| Throws: | Right |
| Birth Date: | September 30, 1869 |
| Birth Place: | Washington, D.C. |
| Death Place: | Newark, New Jersey |
| Debutleague: | MLB |
| Debutdate: | September 24 |
| Debutteam: | Washington Senators |
| Finalleague: | MLB |
| Finaldate: | July 17 |
| Finalteam: | New York Giants |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .187 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 19 |
| Teams: |
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Patrick Henry O'Hagan (September 30, 1869 - January 14, 1913) was a Major League Baseball first baseman who played for two seasons. He played for the Washington Senators in 1892 and for the three following teams in 1902: the Chicago Cubs, the Cleveland Bronchos, and the New York Giants.