List of undefeated boxing world champions
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This is a list of world champions in professional boxing who retired undefeated, either during or after a title reign(s). It excludes current titleholders. Each champion's record is shown in the following format: wins–losses–draws–no contests.
|Boxer||Record||Weight class||Title(s)||Championship years||Title defenses||Notes|
|Jimmy Barry||59–0–9 (2)||Bantamweight||World||1894–1899||6 (3 draws)|
|Joe Calzaghe||46–0–0 (0)||Super middleweight||WBO||1997–2008||21||Vacated title to move up to light heavyweight.|
|IBF||2006||1||Vacated title to fight Peter Manfredo Jr. instead of #1 contender Robert Stieglitz.|
|The Ring, lineal||2006–2008||3||Vacated titles to move up to light heavyweight.|
|Light heavyweight||The Ring||2008||1||Retired and vacated title.|
|Kim Ji-won||16–0–2 (0)||Super bantamweight||IBF||1985–1986||4|
|Mihai Leu||28–0–0 (0)||Welterweight||WBO||1997||1||Retired from boxing due to an injury.|
|Ricardo López||51–0–1 (0)||Minimumweight||WBC||1990–1998||22||Vacated title to move up to light flyweight.|
|WBO||1997–1998||0||Unified WBC and WBO titles. Stripped of WBO title for saying he wanted to give the belt to his father.|
|WBA||1998||0||Vacated title to move up to junior flyweight.|
|Rocky Marciano||49–0–0 (0)||Heavyweight||World||1952–1956||6|
|Terry Marsh||26–0–1 (0)||Light welterweight||IBF||1987||1||Retired from boxing due to epilepsy.|
|Floyd Mayweather Jr.||50–0–0 (0)||Super featherweight||WBC||1998–2002||8||Vacated title to move up to lightweight.|
|Lightweight||WBC||2002–2004||3||Vacated title to move up to light welterweight.|
|Light welterweight||WBC||2005–2006||0||Vacated title to move up to welterweight.|
|Welterweight||WBA, WBC||2006–2008, 2011–2015||8||Retired at 49–0 in 2015; returned in 2017 for non-title McGregor fight and then retired again.|
|Light middleweight||WBA, WBC||2007, 2012–2015, 2017||2|
|Jack McAuliffe||30–0–5 (1)||Lightweight||World||1886–1893||7–0–2 (0)|
|Sven Ottke||34–0–0 (0)||Super middleweight||IBF||1998–2004||21|
|WBA||2003–2004||4||Defended IBF title and defeated WBA champion to become WBA Super champion.|
|Dmitry Pirog||20–0–0 (0)||Middleweight||WBO||2010–2012||3||Retired from boxing due to chronic back injuries.|
|Harry Simon||30–0–0 (0)||Light middleweight||WBO||1998–2001||4||Vacated title to move up to middleweight.|
|Middleweight||WBO||2002||0||Won WBO interim middleweight title in 2001 and the outright title in 2002. Stripped of title at 29–0 when he was unable to defend it due to injuries suffered in a car crash. Had one more non-title fight before retiring.|
|Pichit Sitbangprachan||24–0–0 (0)||Flyweight||IBF||1992–1994||5||Retired at 21–0 and then made a comeback.|
|Edwin Valero||27–0–0 (0)||Super featherweight||WBA||2006–2008||4||Vacated title to move up to lightweight.|
|Lightweight||WBC||2009–2010||2||Vacated title to move up to light welterweight. Committed suicide after allegedly killing his wife in 2010. All 27 fights were knockout wins.|
|Andre Ward||32–0–0 (0)||Super middleweight||WBA||2009–2015||6||Vacated titles in 2015 to move up to light heavyweight.|
|WBC, The Ring, lineal||2011–2015||1 (WBC), 2 (The Ring, lineal)|
|Light heavyweight||WBA, WBO, The Ring, lineal||2016–2017||1 (WBA, IBF, WBO), 0 (The Ring, lineal)|
- List of current world boxing champions
- List of current female world boxing champions
- Longest reigning heavyweight champions
- "Jimmy Barry". Cyber Boxing Zone. Retrieved December 27, 2014.
- "Undefeated Calzaghe quits boxing". BBC. February 5, 2009. Retrieved August 31, 2013.
- "US elite join race for Calzaghe". BBC. November 17, 2008. Retrieved August 31, 2013.
- Justin Tate (June 20, 2011). "Boxing: David Haye and 7 Greatest Fighters to Retire with Less Than 30 Bouts: People Who Did Not Make My List at All". Bleacher Report. Retrieved August 31, 2013.
- "Jamili Takes Strawweight Title". New York Times. Retrieved December 27, 2014.
- "Undefeated heavyweight boxing champion, boxing". Guinness World Records. Retrieved August 31, 2013.
- Undefeated Floyd Mayweather confirms retirement, Sky Sports, 13/09/2015
- "Jack McAuliffe". Cyber Boxing Zone. Retrieved December 27, 2014.
- Michael Rosenthal. "10: Boxers who finished careers undefeated". The Ring magazine. Retrieved August 31, 2013.
- Justin Tate (June 20, 2011). "Boxing: David Haye and 7 Greatest Fighters to Retire with Less Than 30 Bouts: 7. Edwin Valero". Bleacher Report. Retrieved August 31, 2013.
- Graham, Bryan Armen (21 September 2017). "Andre Ward, boxing's pound-for-pound world No1, announces shock retirement". The Guardian. Retrieved 21 September 2017.