Jon Olsen (born 25 April 1969) is an American former swimmer, four-time Olympic champion, 5-time Olympic medalist, and a former world record-holder. Olsen was a highly successful relay swimmer for the U.S. national team in the late 1980s and 1990s.
Olsen represented the United States at two Olympic Games, and won a total number of five Olympic medals, including 4 golds. At the 1992 Barcelona Olympics, he won his first gold medal as a member of the winning U.S. team in the men's 4x100-meter freestyle relay, together with teammates Joe Hudepohl, Matt Biondi and Tom Jager. He won a second gold medal for swimming the freestyle anchor leg for the first-place U.S. team in the men's 4x100-meter medley relay. With his medley relay teammates Jeff Rouse (backstroke), Nelson Diebel (breaststroke), and Pablo Morales (butterfly), he tied the world record in the event of 3:36.93. He also received a bronze medal as a member of the third-place U.S. team in the men's 4x200-meter freestyle relay. Individually, he also placed fourth in the final of the men's 100-meter freestyle with a time of 49.51 seconds.
Four years later at the 1996 Atlanta Olympics, Olsen again won a gold medal as a member of the first-place U.S. team in the men's 4x100-meter freestyle relay with fellow team members Josh Davis, Brad Schumacher, and Gary Hall Jr., and set a new Olympic record of 3:15.41. He received another gold for swimming for the winning U.S. team in the preliminary heats of the men's 4x200-meter freestyle relay. He also competed in the individual men's 100-meter freestyle and placed ninth overall in the B Final of the event with a time of 49.80 seconds.
Olsen swam collegiately for University of Alabama. His currently resides in the Florida Keys with his family where he coaches swimming and gives swim clinics including one with Jeremy Linn at the Alligator Reef Lighthouse Swim.