Ronda Jean Rousey (/ˈraʊzi/ born February 1, 1987) is an American mixed martial artist, judoka, and actress. She is the former UFC Women's Bantamweight Champion, as well as the last Strikeforce Women's Bantamweight Champion. She has won eleven of her fights in the first round, nine of them by armbar. Rousey was the first U.S. woman to earn an Olympic medal in judo (Bronze) at the Summer Olympics in Beijing in 2008. Rousey trains under Gokor Chivichyan of the Hayastan MMA Academy, and Edmond Tarverdyan of the Glendale Fighting Club. In 2015, she was the third most searched person on Google.

As of December 2015, Rousey is ranked the #1 female bantamweight fighter in the world according to the Ultimate Fighting Championship (UFC), and #2 by Sherdog and Fight Matrix. Sherdog lists her as the #3 Pound for Pound Women's MMA fighter in the world, while ESPN and Fight Matrix list her #4 female Pound for Pound fighter.

In May 2015, two magazines ranked Rousey as the most "dominant" active athlete. Rousey was voted on an ESPN poll as the Best Female Athlete Ever. In September 2015, she claimed that she is currently the UFC's highest paid fighter, male or female. Rousey's first feature film role was the 2014 film The Expendables 3. In 2015, she had roles in the films Furious 7 and Entourage.