A quintuple champion in boxing refers to a boxer who has won world titles in five different categories of weight.
In May 2012, citing the number of vacancies in various weight classes as primary motivation, The Ring unveiled a new championship policy.
The Transnational Boxing Rankings Board (TBRB) hands out the official version of the lineal championship.
The Board was formed to continue where The Ring "left off" in the aftermath of its purchase by Golden Boy Promotions in 2007 and the following dismissal of Nigel Collins.
After the new editors announced a controversial new championship policy in May 2012, three prominent members of the Ring Advisory Panel resigned.
Note: The following is a list of quintuple champions who have held titles from one or more of the "Big Four" organizations (WBA, WBC, IBF, WBO) and The Ring.
The following is a list of women’s quintuple champions who have held titles from one or more of the "Big Four" organizations (WBA, WBC, IBF, WBO) and The Ring.