Jason Edward Lezak (born November 12, 1975) is an American former competition swimmer and a four-time Olympic gold medalist. He swam for Irvine Novaquatics. He graduated from Irvine High School in 1994, and then from the University of California, Santa Barbara in 1999.
Lezak was a specialist in the 50-meter and 100-meter freestyle races. He also owns long-course world records in the 400 m freestyle and medley relays, and is a former American record holder in the 100-meter freestyle. Lezak was one of the few elite swimmers not to have a personal coach. Despite this, Lezak enjoys team sports and fellow American Gary Hall, Jr. dubbed Lezak as a "professional relay swimmer" at the 2004 U.S. Olympic Trials before their match-up in the 100-meter freestyle.
Lezak was born in Irvine, California, the son of Linda (née Mann), an elementary school science teacher, and David Lezak, a former leather goods salesman. He is Jewish. The name Lezak is pronounced Leh-Zhack and is Polish (short e). Lezak attended El Camino Real Elementary School (now Woodbury Elementary School) and Irvine High School, as well as the University of California, Santa Barbara. He swam for the UC Santa Barbara Gauchos swimming and diving team from 1995 to 1998. Lezak currently lives in Irvine with his wife, Danielle (DeAlva).
Lezak has competed in four Olympic Games, in 2000, 2004, 2008, and 2012, and won eight Olympic medals, two bronze, two silver, and four gold. He earned a spot on the U.S. team in the 2012 Games in London with a sixth-place finish in the 100-meter freestyle at the Olympic trials.