| Glenn Liebhardt | |
| Position: | Pitcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | March 10, 1883 |
| Birth Place: | Milton, Indiana, U.S. |
| Death Place: | Cleveland, Ohio, U.S. |
| Debutleague: | MLB |
| Debutdate: | October 2 |
| Debutyear: | 1906 |
| Debutteam: | Cleveland Naps |
| Finalleague: | MLB |
| Finaldate: | August 5 |
| Finalyear: | 1909 |
| Finalteam: | Cleveland Naps |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 36–35 |
| Stat3label: | Strikeouts |
| Stat3value: | 280 |
| Stat2label: | Earned run average |
| Stat2value: | 2.17 |
| Teams: |
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Glenn John Liebhardt (March 10, 1883 – July 13, 1956) was a Major League Baseball pitcher who played for four seasons for the Cleveland Naps from 1906 to 1909.
Glenn's son, Glenn Ignatius Liebhardt, was also a major league pitcher.