Jack Chapman Medica (October 5, 1914 – April 15, 1985) was an American competition swimmer, Olympic champion, and former world record-holder in two events.

[1][4] Medica also received a second silver medal as a member of the runner-up U.S. team in the men's 4×200-meter freestyle relay, together with American teammates Ralph Flanagan, John Macionis and Paul Wolf.

[1][6] After his retirement from competition swimming, brought on by World War II, Medica taught water survival for the U.S. Navy after his impaired vision kept him from enlisting.

He went on to teach at the University of Pennsylvania, where he also coached the Penn Quakers swimming and diving team.

During his elite career, Medica won 10 Amateur Athletic Union (AAU) individual national titles and set 11 world records in distances ranging from 200 meters to one mile.