Marlen Esparza (born July 29, 1989) is an American professional boxer who is the former WBC, WBO, WBA and Ring female world flyweight champion.

[10] Esparza won her first professional world title by defeating WBC flyweight champion Ibeth Zamora Silva via unanimous decision at Don Haskins Center, El Paso, Texas, on 19 June 2021.

[12][13] On July 8, 2023, at the AT&T Center in San Antonio, Texas, Esparza defeated Gabriela Celeste Alaniz by majority decision to add the WBO female flyweight title to her collection.

[14][15] Esparza was scheduled to defend her WBA, WBC, WBO flyweight titles in a rematch against Alaniz on March 16, 2024, in Las Vegas[16] but the fight was postponed due to challenger's US VISA issue.

[17][18] The fight eventually took place on April 27, 2024, at Save Mart Arena, Fresno, California, although Esparza missed weight by 2 lbs, and was ineligible to keep the titles in case of her victory.