Thomas Michael Jager (born October 6, 1964) is an American former competition swimmer.
He is five-time Olympic gold medalist in relay events, a two-time World Championship individual gold medalist for the 50-meter freestyle, and a former world record-holder in two events.
Jager set the 50-meter freestyle world record on six occasions during his career.
He held this record for over ten years from August 1989 to June 2000.