Boxing features numerous weight divisions and four main sanctioning bodies awarding world championships. Tracking who holds each title can be complex, particularly due to the existence of interim and secondary champions within these organizations.
To assist fans, here is a quick reference guide listing the current titleholders across the four major boxing organizations (WBO, IBF, WBA, WBC) for each weight class.
Heavyweight (Unlimited)
WBO: Oleksandr Usyk*
IBF: Daniel Dubois
WBA: Oleksandr Usyk**
WBC: Oleksandr Usyk***
*Joseph Parker holds the WBO interim heavyweight title
**Kubrat Pulev is the WBA `regular` heavyweight champion, and Fabio Wardley holds the WBA interim heavyweight title
***Agit Kabayel holds the WBC interim heavyweight title
Cruiserweight (200 lbs.)
WBO: Gilberto Ramirez
IBF: Jai Opetaia
WBA: Gilberto Ramirez
WBC: Badou Jack
Light heavyweight (175 lbs.)
WBO: Dmitry Bivol*
IBF: Dmitry Bivol
WBA: Dmitry Bivol**
WBC: David Benavidez
*Callum Smith holds the WBO interim light heavyweight title
**David Benavidez is the WBA `regular` light heavyweight champion
Super middleweight (168 lbs.)
WBO: Canelo Alvarez
IBF: Canelo Alvarez
WBA: Canelo Alvarez*
WBC: Canelo Alvarez
*Caleb Plant holds the WBA interim super middleweight title
Middleweight (160 lbs.)
WBO: Janibek Alimkhanuly
IBF: Janibek Alimkhanuly
WBA: Erislandy Lara
WBC: Carlos Adames
Junior middleweight (154 lbs.)
WBO: Sebastian Fundora*
IBF: Bakhram Murtazaliev
WBA: Terence Crawford**
WBC: Sebastian Fundora***
*Terence Crawford holds the WBO interim junior middleweight title
**Jermell Charlo is the WBA junior middleweight champion in recess. Yoenis Tellez holds the WBA interim junior middleweight title
***Vergil Ortiz Jr. holds the WBC interim junior middleweight title
Welterweight (147 lbs.)
WBO: Brian Norman Jr.
IBF: Jaron Ennis
WBA: Jaron Ennis
WBC: Mario Barrios
*Terence Crawford is the WBC welterweight champion in recess.
Junior welterweight (140 lbs.)
WBO: Teofimo Lopez Jr.
IBF: Richardson Hitchins
WBA: Gary Antuanne Russell
WBC: Alberto Puello*
*Devin Haney is the WBC junior welterweight champion in recess
Lightweight (135 lbs.)
WBO: Vacant
IBF: Vasiliy Lomachenko*
WBA: Gervonta Davis
WBC: Shakur Stevenson**
*Raymond Muratalla holds the IBF interim lightweight title
**William Zepeda holds the WBC interim lightweight title
Junior lightweight (130 lbs.)
WBO: Emanuel Navarrete
IBF: Eduardo Nunez
WBA: Lamont Roach*
WBC: O`Shaquie Foster
*Albert Batyrgaziev holds the WBA interim junior lightweight title
Featherweight (126 lbs.)
WBO: Rafael Espinoza
IBF: Angelo Leo
WBA: Nick Ball
WBC: Stephen Fulton*
*Rey Vargas is the WBC featherweight champion in recess
Junior featherweight (122 lbs.)
WBO: Naoya Inoue
IBF: Naoya Inoue
WBA: Naoya Inoue
WBC: Naoya Inoue
Bantamweight (118 lbs.)
WBO: Yoshiki Takei
IBF: Ryosuke Nishida
WBA: Seiya Tsutsumi*
WBC: Junto Nakatani
*Antonio Vargas holds the WBA interim bantamweight title
Junior bantamweight (115 lbs.)
WBO: Phumelele Cafu
IBF: Willibaldo Garcia Perez
WBA: Fernando Martinez*
WBC: Jesse Rodriguez
*David Jimenez holds the WBA interim junior bantamweight title
Flyweight (112 lbs.)
WBO: Anthony Olascuaga
IBF: Masamichi Yabuki
WBA: Kenshiro Teraji
WBC: Kenshiro Teraji*
*Galal Yafai holds the WBC interim flyweight title
Junior flyweight (108 lbs.)
WBO: Rene Santiago
IBF: Masamichi Yabuki
WBA: Vacant
WBC: Petchmanee CP Freshmart
Strawweight (105 lbs.)
WBO: Oscar Collazo
IBF: Pedro Taduran
WBA: Oscar Collazo
WBC: Melvin Jerusalem
Ellis Thorne 
Percy Harlow