Kayla Harrison is an American professional mixed martial artist and multiple Olympic gold medalist and world champion judoka. She currently competes in the Women’s Bantamweight division in the Ultimate Fighting Championship (UFC). As of April 16, 2024, she is #4 in the UFC women's bantamweight rankings, and as of May 7, 2024, she is #14 in the UFC women's pound-for-pound rankings.

Judo is an unarmed modern Japanese martial art, combat sport, Olympic sport, and the most prominent form of jacket wrestling competed internationally. Judo was created in 1882 by Kanō Jigorō as an eclectic martial art, distinguishing itself from its predecessors due to an emphasis on "randori" instead of "kata" alongside its removal of striking and weapon training elements. Judo rose to prominence for its dominance over established jujutsu schools in tournaments hosted by the Tokyo Metropolitan Police Department, resulting in its adoption as the department's primary martial art. A judo practitioner is called a "judoka" , and the judo uniform is called "judogi" .