Claressa Maria Shields (born March 17, 1995) is an American professional boxer and former professional mixed martial artist. She has held 18 major world championships spanning five weight classes, including the undisputed female light middleweight title in March 2021; the undisputed female middleweight title twice between 2019 and 2024; the World Boxing Council (WBC) and International Boxing Federation (IBF) female super middleweight titles from 2017 to 2018; the World Boxing Organization (WBO) female light heavyweight title from 2024 to 2025 and the undisputed female heavyweight title since February 2025. Shields is the only female boxer in history to hold all four major world titles in boxing—WBA, WBC, IBF and WBO, in three weight classes. She is also the third female boxer in history to become champion in five different divisions.