| Mike Regan | |
| Position: | Pitcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 19 November 1887 |
| Birth Place: | Phoenix, New York, U.S. |
| Death Place: | Albany, New York, U.S. |
| Debutleague: | MLB |
| Debutdate: | May 13 |
| Debutteam: | Cincinnati Reds |
| Finalleague: | MLB |
| Finaldate: | May 6 |
| Finalteam: | Cincinnati Reds |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 16–15 |
| Stat2label: | Earned run average |
| Stat2value: | 2.84 |
| Stat3label: | Strikeouts |
| Stat3value: | 66 |
| Teams: |
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Michael John Regan (November 19, 1887 – May 22, 1961) was an American Major League Baseball pitcher who played for the Cincinnati Reds from to .