John Anthony Mostil (June 1, 1896 – December 10, 1970) was an American center fielder in Major League Baseball who played his entire career for the Chicago White Sox (1918, 1921–29). Born in Chicago, he had a career batting average of .301.

Mostil led the American League in runs scored in 1925, and in stolen bases in 1925 and 1926. Mostil attempted suicide in 1927. He recovered, but only played two more years. He hit .300 4 times with a high of .328 in 1926.

After retiring as an active player, Mostil became a minor league manager and a scout for the White Sox. In the 1960s, he coached at the Chicago White Sox Boys Camp, a sports camp in Brothertown, Wisconsin, owned by the Chicago White Sox. Mostil died at age 74 in Midlothian, Illinois.

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