Kayla Jean Harrison (born July 2, 1990) is an American professional mixed martial artist and former Olympic and world champion judoka, currently signed to the Professional Fighters League (PFL). Harrison competed in the 78 kg (172 lb) weight category in judo. She won the 2010 World Judo Championships, gold medals at the 2012 and 2016 Olympics, and gold at the 2011 and 2015 Pan American Games. After the 2016 Olympics, she moved into mixed martial arts and currently fights in the lightweight division.