Misty May Treanor is a retired professional beach volleyball player. As the starting setter in 1998, May-Treanor led Long Beach State University to the Division I NCAA Women's Volleyball Championship with a 36–0 record. She shared the NCAA Championship Most Outstanding Player award after setting a tournament record with 20 aces.

She is a three-time Olympic gold medalist, and as of August 2012, was the most successful female beach volleyball player in history, with 112 individual championship wins in domestic and international competition. May-Treanor and teammate Kerri Walsh Jennings were gold medalists in beach volleyball at the 2004, 2008 and 2012 Summer Olympics. They also won the FIVB Beach Volleyball World Championships in 2003, 2005 and 2007. They have been called "the greatest beach volleyball team of all time.

May-Treanor retired from competitive play on August 8, 2012 after she and Walsh Jennings won gold in the 2012 Summer Olympics. She was inducted into the Volleyball Hall of Fame in 2016. As of July 2016, she serves as the Director of Volleyball at Long Beach City College where she coaches the women's indoor and beach volleyball teams.