Elizabeth Lyon Beisel (born August 18, 1992) is an American competition swimmer who specializes in backstroke and individual medley events. She has won a total of nine medals in major international competition, four gold, one silver, and four bronze spanning the Olympics, World Aquatics, and the Pan Pacific championships. Beisel competed in the 200-meter backstroke and 400-meter individual medley events at the 2008 Summer Olympics, placing fifth and fourth, respectively, in the world.