| John Cassidy | |
| Position: | Outfielder |
| Bats: | Right |
| Throws: | Left |
| Birth Place: | Brooklyn, New York, U.S. |
| Death Place: | Brooklyn, New York, U.S. |
| Debutleague: | MLB |
| Debutdate: | April 24 |
| Debutyear: | 1875 |
| Debutteam: | Brooklyn Atlantics |
| Finalleague: | MLB |
| Finaldate: | August 12 |
| Finalyear: | 1885 |
| Finalteam: | Brooklyn Grays |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .246 |
| Stat2label: | Home runs |
| Stat2value: | 5 |
| Stat3label: | Runs batted in |
| Stat3value: | 191 |
| Teams: |
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John P. Cassidy (1855 – July 3, 1891) was an American outfielder in Major League Baseball from to . He was a pitcher in his first season, 1875, with the Brooklyn Atlantics but went 1–21 that season and was moved to the outfield the following year.[1]
Cassidy died at the age of 36 in his hometown of Brooklyn, New York of dropsy,[2] and is interred at Flatbush Cemetery.[1]