| Birth Date: | May 17, 1917 |
| Birth Place: | Chicago, Illinois |
| Death Date: | April 29, 1979 |
| Death Place: | Winnetka, Illinois |
| Occupation: | Co-owner, Chicago White Sox |
| Father: | --> |
| Relatives: | Arthur Allyn, Jr. (Brother) |
| Sport: | Baseball |
| League: | Major League Baseball |
| Club: | Chicago White Sox |
John Allyn (May 17, 1917 – April 29, 1979) was the co-owner of the Chicago White Sox of the American League with his brother Arthur Allyn, Jr. from through, and sole principal owner from through . In addition, John Allyn served as president of the Chicago Mustangs soccer team which he co-owned with his brother, Arthur. In 1975, Allyn sold the club back to the person he and his brother had purchased it from in 1961, Bill Veeck.