Harry Cassady should not be confused with Harry Cassidy.
| Harry Cassady | |
| Position: | Outfielder |
| Bats: | Left |
| Throws: | Left |
| Birth Date: | July 20, 1880 |
| Birth Place: | Bellflower, Illinois, U.S. |
| Death Place: | Fresno, California, U.S. |
| Debutleague: | MLB |
| Debutdate: | August 8 |
| Debutyear: | 1904 |
| Debutteam: | Pittsburgh Pirates |
| Finalleague: | MLB |
| Finaldate: | May 28 |
| Finalyear: | 1905 |
| Finalteam: | Washington Senators |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .176 |
| Stat2label: | Home runs |
| Stat2value: | 4 |
| Stat3label: | Runs batted in |
| Stat3value: | 2 |
| Teams: |
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Harry Delbert Cassady (born Harry Delbert Cassaday) (July 20, 1880 – April 19, 1969) was an American professional baseball player who played outfield in the Major Leagues for the 1904 Pittsburgh Pirates and 1905 Washington Senators. He went to Illinois Wesleyan University.