There are 17 weight classes in professional boxing, and five major recognised belts for each of the divisions: The WBA (World Boxing Association), WBC (World Boxing Council), IBF (International Boxing Federation), WBO (World Boxing Organization) and The Ring.
There are four recognised major bodies in boxing, the WBA, WBC, IBF and the WBO. The Ring title is awarded by American boxing magazine, The Ring, and has been done since 1922.
The mixture of belts and champions means that there is only a rare occasion when a class can be fully unified to produce an undisputed champion.
Boxers often fight across weight classes in order to maximise their chances of success, with boxers stepping up and down various classes.
Here is every champion in each weight class for women's boxing.
Heavyweight
- WBA: N/A
- WBC: Claressa Shields
- IBF: N/A
- WBO: Vacant
- The Ring: N/A
Cruiserweight
- WBA: Che Kenneally
- WBC: N/A
- IBF: N/A
- WBO: Vacant
- The Ring: N/A
Light heavyweight
- WBA: Che Kenneally
- WBC: N/A
- IBF: Lani Daniels
- WBO: Claressa Shields
- The Ring: N/A
Super middleweight
- WBA: Franchon Crews-Dezurn
- WBC: Franchon Crews-Dezurn
- IBF: Savannah Marshall
- WBO: Shadasia Green
- The Ring: Savannah Marshall
Middleweight
- WBA: Claressa Shields
- WBC: Claressa Shields
- IBF: Vacant
- WBO: Vacant
- The Ring: Claressa Shields
Super welterweight/Junior middleweight
- WBA: Terri Harper / Mary Spencer (Interim)
- WBC: Ema Kozin / Cecilia Brækhus (Interim)
- IBF: Oshae Jones
- WBO: Ema Kozin
- The Ring: Vacant
Welterweight
- WBA: Lauren Price / Ivana Habazin (Interim)
- WBC: Natasha Jones
- IBF: Natasha Jonas
- WBO: Mikaela Mayer
- The Ring: Lauren Price
Super lightweight/Junior welterweight
- WBA: Katie Taylor
- WBC: Katie Taylor / Chantele Cameron (Interim)
- IBF: Katie Taylor
- WBO: Katie Taylor
- The Ring: Katie Taylor
Lightweight
- WBA: Katie Taylor
- WBC: Katie Taylor / Caroline Dubois (Interim)
- IBF: Beatriz Ferreira
- WBO: Terri Harper
- The Ring: Katie Taylor
Super featherweight/Junior lightweight
- WBA: Alycia Baumgardner
- WBC: Alycia Baumgardner
- IBF: Alycia Baumgardner
- WBO: Alycia Baumgardner
- The Ring: Alycia Baumgardner
Featherweight
- WBA: Amanda Serrano / Jennifer Miranda (Interim)
- WBC: Skye Nicolson
- IBF: Nina Meinke
- WBO: Amanda Serrano
- The Ring: Amanda Serrano
Super bantamweight/Junior featherweight
- WBA: Nazarena Romero
- WBC: Yamileth Mercado
- IBF: Ellie Scotney
- WBO: Ellie Scotney
- The Ring: Ellie Scotney
Bantamweight
- WBA: Cherneka Johnson
- WBC: Dina Thorslund
- IBF: Shurretta Metcalf
- WBO: Dina Thorslund
- The Ring: Dina Thorslund
Super flyweight/Junior bantamweight
- WBA: Clara Lescurat
- WBC: Asley Gonzalez Macias / Virginia Fuchs (Interim)
- IBF: Irma Garcia
- WBO: Mizuki Hiruta
- The Ring: Vacant
Flyweight
- WBA: Gabriela Fundora / Maria Magdalena Rivera (Interim)
- WBC: Gabriela Fundora / Kenia Enríquez (Interim)
- IBF: Gabriela Fundora
- WBO: Gabriela Fundora
- The Ring: Gabriela Fundora
Light/Junior flyweight
- WBA: Jessica Nery Plata / Sara Haghighat-Joo (Interim)
- WBC: Jessica Nery Plata
- IBF: Evenlyn Nazarena Bermudez
- WBO: Evenlyn Nazarena Bermudez
- The Ring: Vacant
Minimumweight/Mini flyweight
- WBA: Vacant
- WBC: Yokasta Valle / Umi Ishikawa (Interim)
- IBF: Vacant
- WBO: Sarah Bormann
- The Ring: Vacant
Atomweight
- WBA: Tina Rupprecht
- WBC: Tina Rupprecht
- IBF: Sumire Yamanaka
- WBO: Tina Rupprecht
- The Ring: Tina Rupprecht
You can read more on how the world championship system works in boxing here.