| Harry DeMiller | |
| Position: | Pitcher |
| Bats: | Right |
| Throws: | Left |
| Birth Date: | November 12, 1867 |
| Birth Place: | Wooster, Ohio |
| Death Place: | Santa Ana, California |
| Debutleague: | MLB |
| Debutdate: | August 20 |
| Debutyear: | 1892 |
| Debutteam: | Chicago Colts |
| Finalleague: | MLB |
| Finaldate: | October 6 |
| Finalyear: | 1892 |
| Finalteam: | Chicago Colts |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 1–1 |
| Stat2label: | Strikeouts |
| Stat2value: | 15 |
| Stat3label: | Earned run average |
| Stat3value: | 6.38 |
| Teams: |
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Harry DeMiller (November 12, 1867 – October 19, 1928), was a professional baseball player who played pitcher in the Major Leagues for the 1892 Chicago Colts.