Jay Paul Mortenson (born September 26, 1966) is an American former competition swimmer and Olympic gold medalist.

He earned a gold medal by swimming for the winning U.S. team in the preliminary heats of the men's 4×100-meter medley relay at the 1988 Summer Olympics in Seoul, South Korea.

He also finished sixth in the final of the men's 100-meter butterfly, and eleventh overall in the B Final of the men's 100-meter backstroke.

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