| Jack Ryan | |
| Position: | Outfielder |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 5 May 1905 |
| Birth Place: | West Mineral, Kansas |
| Death Place: | Rochester, Minnesota |
| Debutleague: | MLB |
| Debutdate: | June 18 |
| Debutteam: | Boston Red Sox |
| Finalleague: | MLB |
| Finaldate: | June 20 |
| Finalteam: | Boston Red Sox |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .000 |
| Stat2label: | Games played |
| Stat2value: | 2 |
| Stat3label: | At bats |
| Stat3value: | 3 |
| Teams: |
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John Francis Ryan (May 5, 1905 – September 2, 1967) was a reserve outfielder in Major League Baseball who played briefly for the Boston Red Sox during the season. Listed at, 185 lb., Ryan batted and threw right-handed. He was born in West Mineral, Kansas.
Little is known about this LF/RF who played on a Red Sox uniform with few stars. The team finished last with a 58–96 record and only 394,620 fans came to see them play at Fenway Park that season. Ryan appeared in two games and went hitless in three at-bats, as he did not commit error in his only fielding chance.
Ryan died at the age of 62 in Rochester, Minnesota.