Mary Killman (born April 9, 1991) is an American synchronized swimmer. After switching to synchronized swimming from race swimming, Killman was part of teams that won silver medals in the duet and team competitions at the 2011 Pan American Games in Guadalajara, Mexico. She qualified with Mariya Koroleva to compete in the 2012 Summer Olympics in London.
Killman was born on April 9, 1991 in Ada, Oklahoma, and grew up in Texas. She is a member of the Citizen Potawatomi Nation, a federally recognized tribe based in Oklahoma. Originally a competitor in racing events, Killman began to participate in synchronized swimming competitions at the age of 11, and at age 15 gave up racing to focus exclusively on synchronized swimming.
After competing in youth competitions through the 2000s, in 2009 Killman found success at the United States National Championships, winning 3rd in the solo competition, 2nd in the duet competition, and 1st in the team competition. Shortly before the 2011 Pan American Games in Guadalajara, Mexico, she was partnered with Mariya Koroleva to compete as a duet. At those games, Killman and Koroleva won a silver medal in the duet competition, and were part of the United States team that won a silver in the team competition as well. The pair qualified for the 2012 Summer Olympics in London, and due to the failure of the United States to qualify a team for the team synchronized swimming event, will be the only American women to compete in synchronized swimming at those games. While training for the Olympics in Indianapolis, Killman and Koroleva shared a room.
At London, Killman and Koroleva finished 11th in the duet event.
Following the 2012 Olympics, Killman joined the Lindenwood University synchronized swimming team, one of six collegiate varsity synchronized programs in the United States.
She is a member of The Church of Jesus Christ of Latter-day Saints.
Recently, Killman & Koroleva appeared on Whose Line is it Anyway?.