| John Ryan | |
| Position: | Pitcher/Outfielder |
| Bats: | Left |
| Throws: | Right |
| Birth Date: | Unknown |
| Birth Place: | Birmingham, Michigan |
| Death Date: | Unknown |
| Debutleague: | MLB |
| Debutdate: | June 11 |
| Debutyear: | 1884 |
| Debutteam: | Baltimore Monumentals |
| Finalleague: | MLB |
| Finaldate: | August 27 |
| Finalyear: | 1884 |
| Finalteam: | Baltimore Monumentals |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 3-2 |
| Stat2label: | Earned run average |
| Stat2value: | 3.35 |
| Stat3label: | Strikeouts |
| Stat3value: | 33 |
| Teams: |
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John A. Ryan was a Major League Baseball pitcher. He played for the Baltimore Monumentals of the Union Association in the 1884 season. He also played for the Chattanooga Lookouts in the Southern League in 1885.