| Ernie Diehl | |
| Position: | Outfielder |
| Birth Date: | 2 October 1877 |
| Birth Place: | Cincinnati, Ohio |
| Death Place: | Miami, Florida |
| Bats: | Right |
| Throws: | Right |
| Debutleague: | MLB |
| Debutdate: | May 31 |
| Debutyear: | 1903 |
| Debutteam: | Pittsburgh Pirates |
| Finalleague: | MLB |
| Finaldate: | August 12 |
| Finalyear: | 1909 |
| Finalteam: | Boston Doves |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .255 |
| Stat2label: | Hits |
| Stat2value: | 14 |
| Teams: |
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Ernest Guy Diehl (October 2, 1877 – November 6, 1958) was a Major League Baseball outfielder who played for four seasons. He played for the Pittsburgh Pirates from 1903 to 1904, and the Boston Beaneaters/Doves in 1906 and 1909.
He served as the head baseball coach at the University of Cincinnati in 1910.[1]
Diehl also played tennis. At the Cincinnati Open he: