Julianna Nicole Peña (born August 19, 1989) is an American professional mixed martial artist who competes in the bantamweight division of the Ultimate Fighting Championship, where she is the former UFC Women's Bantamweight Champion. Peña is the first woman to win The Ultimate Fighter. As of November 15, 2022, she is #4 in the UFC women's pound-for-pound rankings,, and as of August 1, 2022, she is #1 in the UFC women's bantamweight rankings.