Janet Beth Evans (born August 28, 1971) is an American former competition swimmer who specialized in distance freestyle events. Evans was a world champion and world record-holder, and won a total of four gold medals at the 1988 and the 1992 Olympics.

At the 1988 Summer Olympics in Seoul, South Korea, she won three individual gold medals, and she also earned the nickname "Miss Perpetual Motion." In these Olympics, Evans set a new world record in the 400-meter freestyle event. This record stood for 18 years until France's Laure Manaudou broke it in May 2006.

Janet Evans was the 1989 recipient of the James E. Sullivan Award as the top amateur athlete in the United States.

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