John Allyn (May 17, 1917 in Chicago, Illinois – April 29, 1979 in Winnetka, Illinois) 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.