The International Boxing Organization (IBO) is a US based corporation that sanctions professional boxing matches and awards world and regional championships.
In boxing, the undisputed champion of a weight class is the boxer who simultaneously holds world titles from all major organizations recognized by each other and the International Boxing Hall of Fame. There are currently four major sanctioning bodies: WBA, WBC, WBO, and IBF. There were many undisputed champions before the number of major sanctioning bodies recognizing each other increased to four in 2007, but there have been only 19 boxers to hold all four titles simultaneously.
Lester Ellis is a British-born Australian former professional boxer. He is a five-time world champion, having also held the Australian and Commonwealth (twice) titles.
Jhonny González Vera is a Mexican professional boxer. He is a two-time former world champion in two weight classes, having held the WBO bantamweight title from 2005 to 2007, and the WBC featherweight title twice between 2011 and 2015. Additionally, he held the IBO featherweight title from 2010 to 2011.
Junior Jones is an American former professional boxer who competed from 1989 to 2002. He held world championships in two weight classes, including the World Boxing Association (WBA) bantamweight title from 1993 to 1994 and the World Boxing Organization (WBO) super bantamweight title from 1996 to 1997. He also held the International Boxing Organization (IBO) featherweight title from 1999 to 2000.
Eva Ulrika Birgitta Räsänen is a Finnish former professional boxer who competed from 2010 to 2020. She held the WBC female super-featherweight title from 2015 to 2020 and at regional level the European female super-featherweight title from 2012 to 2015. As an amateur she won a silver medal in the lightweight division at the 2004 and 2005 Women's European Championships, and represented Finland at the 2006 Women's World Championships. She is the most successful professional boxer from Finland to date, being the first and only Finn to have won a world title from one of the four major boxing sanctioning bodies.
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.
Mikaela Joslin Mayer is an American professional boxer. She is a former unified female super-featherweight World champion having held the WBO and the IBF titles simultaneously. She has also been interim WBC female lightweight World champion. As an amateur she won a bronze medal at the 2012 World Championships and competed for the U.S. at the 2016 Olympics.
Shavkatdzhon Shokirovich Rakhimov is a Tajikistani professional boxer. He held the International Boxing Federation (IBF) junior lightweight title from 2022 to 2023 and the International Boxing Organisation (IBO) super-featherweight title from 2017 to 2019. As of June 2023, he is ranked as the world's fifth best active super-featherweight by the Transnational Boxing Rankings Board, fourth by BoxRec and fifth by The Ring.
Hannah Rankin is a Scottish professional boxer who has held the WBA and IBO female super-welterweight World titles.
Terri Harper is an English professional boxer and current WBA and IBO Super-Welterweight champion. She is also the former super-featherweight world champion, having held the IBO female title from 2019 to November 2021 and the WBC version from 2020 to November 2021. Following a brief amateur career, Harper made her professional debut in 2017. She won her first championship two years later, capturing the regional WBC International female lightweight title in 2019. Later that year she moved down a weight class to the super-featherweight division to win her first world championship, the vacant IBO title, and added the WBC title to her collection the following year after defeating long-reigning champion Eva Wahlström. With her victory over Wahlström, Harper became the second British woman after Nicola Adams to hold a major world championship.
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.
Katharina Thanderz is a Norwegian professional boxer who has held the WBC interim female super-featherweight World title and the European female super-featherweight title.
Edith Soledad Matthysse is an Argentine professional boxer who is a former unified featherweight world champion, having held the WBA female title from 2013 to 2016 and the WBC female title from 2015 to 2016. She is the older sister of former welterweight world champion of boxing, Lucas Matthysse.
Alycia Baumgardner is an American professional boxer. She has held the WBC and IBO female super featherweight titles since 2021, and the WBO, IBF, and The Ring female super featherweight titles since 2022. She became the undisputed female super featherweight champion of the world on February 4, 2023.
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.
Marea Kirimiria Motu is a New Zealand Maori Professional Boxer.
Boxing in the 2020s is a list of notable fights and events in boxing during the decade from the year 2020 to 2029.
