Mark Daniel Gangloff (born June 8, 1982) is an American former competition swimmer, Olympic gold medalist, world champion, and former world record-holder.

Gangloff represented the United States at two consecutive Summer Olympics.

At the 2004 Summer Olympics in Athens, he earned a gold medal by swimming for the winning U.S. team in the preliminary heats of the 4×100-meter medley relay.

[1] Gangloff broke the American record in the 100-meter breaststroke with a time of 59.01 at the U.S.

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