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: Fabio Wardley
IBF: Oleksandr Usyk
WBA: Oleksandr Usyk*
WBC: Oleksandr Usyk**
*Murat Gassiev is the WBA "regular" heavyweight champion
**Agit Kabayel is the WBC interim heavyweight hampion
Cruiserweight (200 lbs.)
WBO: Gilberto Ramirez
IBF: Jai Opetaia
WBA: Gilberto Ramirez
WBC: Norair Mikaeljan
Light heavyweight (175 lbs.)
WBO: Dmitry Bivol*
IBF: Dmitry Bivol
WBA: Dmitry Bivol**
WBC: David Benavidez
*Callum Smith is the WBO interim light heavyweight champion
**David Benavidez is the WBA "regular" light heavyweight champion
Super middleweight (168 lbs.)
WBO: Vacant
IBF: Vacant
WBA: Jose Armando Resendiz
WBC: Vacant*
*Christian Mbilli is the WBC interim super middleweight champion
Middleweight (160 lbs.)
WBO: Janibek Alimkhanuly
IBF: Janibek Alimkhanuly
WBA: Erislandy Lara
WBC: Carlos Adames
Junior middleweight (154 lbs.)
WBO: Xander Zayas
IBF: Bakhram Murtazaliev
WBA: Abass Baraou*
WBC: Sebastian Fundora**
*Jaron Ennis is the WBA interim junior middleweight champion
**Vergil Ortiz Jr. is the WBC interim junior middleweight champion
Welterweight (147 lbs.)
WBO: Devin Haney
IBF: Lewis Crocker
WBA: Rolando Romero
WBC: Mario Barrios
Junior welterweight (140 lbs.)
WBO: Teofimo Lopez Jr.
IBF: Richardson Hitchins
WBA: Gary Antuanne Russell
WBC: Dalton Smith*
*Isaac Cruz is the WBC interim junior welterweight champion
Lightweight (135 lbs.)
WBO: Abdullah Mason
IBF: Raymond Muratalla
WBA: Gervonta Davis
WBC: Shakur Stevenson*
*Jadier Herrera is the WBC interim lightweight champion
Junior lightweight (130 lbs.)
WBO: Emanuel Navarrete
IBF: Eduardo Nunez
WBA: Lamont Roach*
WBC: O'Shaquie Foster
*James Dickens is the WBA interim junior lightweight champion
Featherweight (126 lbs.)
WBO: Rafael Espinoza
IBF: Angelo Leo
WBA: Nick Ball
WBC: Stephen Fulton*
*Rey Vargas is the WBC featherweight champion in recess and Bruce Carrington is the WBC interim featherweight champion
Junior featherweight (122 lbs.)
WBO: Naoya Inoue
IBF: Naoya Inoue
WBA: Naoya Inoue
WBC: Naoya Inoue
Bantamweight (118 lbs.)
WBO: Christian Medina
IBF: Jose Salas Reyes
WBA: Seiya Tsutsumi
WBC: Vacant
Junior bantamweight (115 lbs.)
WBO: Jesse Rodriguez
IBF: Willibaldo Garcia Perez
WBA: Jesse Rodriguez*
WBC: Jesse Rodriguez
*David Jimenez is the WBA interim junior bantamweight interim champion
Flyweight (112 lbs.)
WBO: Anthony Olascuaga
IBF: Masamichi Yabuki
WBA: Ricardo Sandoval
WBC: Ricardo Sandoval*
*Galal Yafai is the WBC interim flyweight champion
Junior flyweight (108 lbs.)
WBO: Rene Santiago
IBF: Thanongsak Simsri
WBA: Rene Santiago
WBC: Carlos Canizales
Strawweight (105 lbs.)
WBO: Oscar Collazo
IBF: Pedro Taduran
WBA: Oscar Collazo
WBC: Melvin Jerusalem