With 17 weight classes in boxing and four major sanctioning bodies that bestow world titles, keeping track of who holds each of the belts can be difficult -- especially when there are sometimes multiple titlists in each organization because of interim and secondary belts.
To make it easier for boxing fans, below is a quick reference chart of who holds each of the titles in the four organizations
To check the top 10 fighters in each division, visit ESPN's divisional rankings.
For a list of the best fighters regardless of weight class, check ESPN's pound-for-pound rankings.
Heavyweight (Unlimited)
WBO: Oleksandr Usyk*
IBF: Oleksandr Usyk
WBA: Oleksandr Usyk
WBC: Tyson Fury
*Zhilei Zhang is the WBO interim heavyweight champion
Cruiserweight (200 lbs.)
WBO: Chris Billam-Smith
IBF: Vacant
WBA: Arsen Goulamirian
WBC: Noel Gevor Mikaelyan
Light heavyweight (175 lbs.)
WBO: Artur Beterbiev
IBF: Artur Beterbiev
WBA: Dmitry Bivol
WBC: Artur Beterbiev
Super middleweight (168 lbs.)
WBO: Canelo Alvarez
IBF: Canelo Alvarez
WBA: Canelo Alvarez*
WBC: Canelo Alvarez**
*David Morrell is the WBA "regular" super middleweight champion
**David Benavidez is the WBC interim super middleweight champion
Middleweight (160 lbs.)
WBO: Janibek Alimkhanuly
IBF: Janibek Alimkhanuly
WBA: Erislandy Lara
WBC: Jermall Charlo*
*Carlos Adames is the WBC interim champion
Junior middleweight (154 lbs.)
WBO: Tim Tszyu
IBF: Vacant
WBA: Jermell Charlo
WBC: Jermell Charlo*
*Brian Mendoza is the WBC interim junior middleweight champion
Welterweight (147 lbs.)
WBO: Terence Crawford
IBF: Jaron Ennis
WBA: Terence Crawford*
WBC: Terence Crawford**
*Eimantas Stanionis is the WBA "regular" champion
**Mario Barrios is the WBC interim champion
Junior welterweight (140 lbs.)
WBO: Teofimo Lopez Jr.
IBF: Subriel Matias
WBA: Rolando Romero
WBC: Devin Haney
Lightweight (135 lbs.)
WBO: Vacant
IBF: Vacant
WBA: Vacant*
WBC: Shakur Stevenson
*Gervonta Davis is the WBA "regular" lightweight champion
Junior lightweight (130 lbs.)
WBO: Emanuel Navarrete
IBF: Joe Cordina
WBA: Lamont Roach
WBC: O'Shaquie Foster
Featherweight (126 lbs.)
WBO: Rafael Espinoza
IBF: Luis Alberto Lopez
WBA: Vacant
WBC: Rey Vargas*
*Brandon Figueroa is the WBC interim featherweight champion
Junior featherweight (122 lbs.)
WBO: Naoya Inoue
IBF: Marlon Tapales
WBA: Marlon Tapales
WBC: Naoya Inoue
Bantamweight (118 lbs.)
WBO: Jason Moloney
IBF: Vacant
WBA: Takuma Inoue
WBC: Alexandro Santiago
Junior bantamweight (115 lbs.)
WBO: Junto Nakatani
IBF: Fernando Martinez
WBA: Kazuto Ioka
WBC: Juan Francisco Estrada*
*Juan Francisco Estrada is the WBC "franchise" junior bantamweight champion
Flyweight (112 lbs.)
WBO: Jesse Rodriguez
IBF: Jesse Rodriguez
WBA: Artem Dalakian
WBC: Julio Cesar Martinez*
*McWilliams Arroyo is the WBC interim flyweight champion
Junior flyweight (108 lbs.)
WBO: Jonathan Gonzalez
IBF: Adrian Curiel
WBA: Kenshiro Teraji
WBC: Kenshiro Teraji
Strawweight (105 lbs.)
WBO: Oscar Collazo
IBF: Ginjiro Shigeoka
WBA: Knockout CP Freshmart*
WBC: Yudai Shigeoka
*Erick Rosa is the WBA "regular" strawweight champion