In boxing, the undisputed champion of a weight class is the boxer who simultaneously holds world sanctioning organisations recognized major by each other and the International Boxing Hall of Fame. There are currently four major sanctioning bodies: WBA, WBC, IBF and WBO. There were many undisputed champions before the number of major sanctioning bodies recognizing each other increased to four in 2007, but there have only been 18 boxers to hold all four titles simultaneously.
Katie Taylor is an Irish professional boxer and former footballer. She is the undisputed and lineal world lightweight champion since 2019, and the undisputed and lineal world super lightweight champion since 2023.
Amanda Serrano is a Puerto Rican professional boxer, mixed martial artist and professional wrestler. As a boxer, she is the unified featherweight world champion, having held the WBO title since 2019, IBO title since 2021, IBF title since 2022 and the WBA title since 2023. She is the only female, and Puerto Rican, to win world titles in more than four weight classes, and holds the Guinness World Record for the most boxing world championships won in different weight-classes by a female, having held 9 major world titles across seven different weight classes.
Delfine Persoon is a Belgian professional boxer. She held the IBF female lightweight title in 2012 and the WBC female lightweight title from 2014 to June 2019, losing the title in a unification fight against Katie Taylor for the undisputed lightweight championship. As of September 2020, she is ranked as the world's best active female super-featherweight by BoxRec, the second best active female lightweight by The Ring, and the second best active female, pound for pound, by BoxRec, fifth by The Ring and seventh by ESPN.
Érica Anabella Farías, known as "La Pantera", is an Argentine professional boxer. She is a two-weight world champion, having held the WBC female lightweight title from 2011 to 2014 and the WBC female super lightweight title from 2014 to 2018. She also challenged once for the undisputed welterweight championship in 2017. As an amateur, she won a silver medal at the 2006 World Championships. As of October 2020, she is ranked as the world's second best active female super lightweight by BoxRec and fourth by The Ring.
Teófimo Andrés López Rivera is an American professional boxer. He has held multiple world championships in two weight classes, including the World Boxing Organization (WBO) and Ring magazine light welterweight titles since June 2023; previously he held the unified World Boxing Association (WBA), International Boxing Federation (IBF), WBO, and Ring lightweight titles between 2019 and 2021. Lopez has also held the lineal championship at lightweight and light welterweight. As an amateur, he represented Honduras at the 2016 Summer Olympics.
Victoria Noelia Bustos is an Argentine professional boxer. She is a two-weight world champion, having held the IBF female lightweight title from 2013 to 2018 and the IBF female light welterweight title in 2019. She also challenged once for the undisputed female welterweight title in 2019.
Rose Volante is a Brazilian professional boxer who held the WBO female lightweight title from 2017 to 2019.
Jessica McCaskill is an American professional boxer. She is a world champion in two weight classes, having held the undisputed, IBO, and Ring female welterweight titles since 2020; the WBC female super lightweight title from 2018 to 2020; and the WBA female super lightweight title from 2019 to 2020. She also challenged for the WBA lightweight title in 2017. As of September 2020, she is ranked as the world's best active female welterweight by The Ring and BoxRec, and the third best active female, pound for pound, by BoxRec, and fourth by The Ring and ESPN.
Chantelle Cameron is an English professional boxer. She is a former world champion in two weight classes, including the former undisputed light-welterweight champion, having held the WBC title between 2020 and 2023; the IBF and Ring magazine titles between 2021 and 2023 ; and the WBA and WBO titles between November 2022 and 2023. She previously held the IBO female lightweight title from 2017 to 2019 and light-welterweight title from 2022 to 2023.
Viviane Obenauf is a Brazilian former professional boxer who competed from 2014 to 2019. She has challenged three times for world titles; the IBO female lightweight title in 2017; the IBF female super featherweight title in 2018; and the IBO female super featherweight title in 2019.
Anisha Dzombe Basheel is a Malawian professional boxer who has held the Commonwealth female lightweight title since 2018 and the ABU female super-featherweight title since 2017.
Jennifer Han is an American professional boxer who held the IBF female featherweight title from 2015 to 2020, and was the first world champion boxer from El Paso, Texas. As of July 2021, she is ranked as the world's sixth best active female lightweight by BoxRec.
Anahí Ester Sánchez is an Argentine professional boxer. She is a three-weight world champion, having held the IBF female super-featherweight title in 2016; the WBA female lightweight title in 2017; and the WBA female super lightweight title in 2019. She also held the WBA interim female featherweight title in 2015 and the WBA interim female super-lightweight title from 2018 to 2019, and challenged for the WBC and IBF female super-featherweight, and WBC female super-lightweight titles between 2016 and 2019.
Helen Joseph is a Nigerian professional boxer who has challenged twice for the IBF female featherweight title in 2012 and 2015.
Cindy Serrano is a Puerto Rican professional boxer who held the WBO female featherweight title from 2016 to 2017. She also challenged for the WIBA featherweight title in 2005; the WIBA and WIBF welterweight titles in 2011; and the unified WBA and IBF female lightweight titles in 2018. Her younger sister, Amanda, is also a professional boxer. The pair became the first sisters to hold world titles from major sanctioning bodies at the same time after Cindy captured the WBO title in 2016.
Firuza Sharipova is a Kazakhstani professional boxer who held the WIBA lightweight title in 2019. As of December 2021, she is ranked number two in the world by the WBA.
Katie Taylor vs. Amanda Serrano, billed as For History, was a women's lightweight professional boxing match contested between the undisputed world champion Katie Taylor and seven-division world champion Amanda Serrano. The bout was held on April 30, 2022, at Madison Square Garden in New York City, with Taylor's undisputed lightweight titles on the line. It was the first women's boxing match to headline Madison Square Garden, and was described as the 'biggest women's fight of all time'. Taylor defeated Serrano by split decision.
Katie Taylor 
The O2 Arena, London, England
Jasmine Clarkson
Victoria Bustos 
Amanda Serrano 