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) held||Championship years||Title defenses||Notes|
|Jimmy Barry||58–0–10 (1)||Bantamweight||World||1894-1919||4 withdraws by opponent|
|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||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, The Ring||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||IBF||2006||0||Vacated title to challenge Carlos Baldomir for his WBC title.|
|WBC, The Ring||2006–2008, 2011–2015||6||Retired in 2008, few months after defeating Ricky Hatton. Declared Emeritus Champion by the WBC. Reclaimed the title in 2011 by defeating Victor Ortiz. Retired at 49–0 in 2015; returned in 2017 for non-title McGregor fight and then retired again.|
|Light middleweight||WBC||2007, 2013-2015||1|
|Jack McAuliffe||28–0–10||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 spinal injuries.|
|Harry Simon||31–0–0 (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 22–0 when he was unable to defend it due to injuries suffered in a car crash. Had others non-title fights 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||2011–2015||1 (WBC), 2 (The Ring)|
|Light heavyweight||WBA, WBO, IBF, The Ring||2016–2017||1 (WBA, IBF, WBO), 0 (The Ring)|
|Boxer||Record||Weight class||Title(s)||Championship years||Title defenses||Notes|
|Michele Aboro||21–0–0 (0)||Super bantamweight||WIBF||2000–2001||3|
|Nicola Adams||5–0–1 (0)||Flyweight||WBO||2019||1||Retired due to medical concerns.|
|Laila Ali||24–0–0 (0)|
|Kara Ro||17–0–0 (0)|
|Wang Ya Nan||8–0–0 (0)|
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Michael Spinks is an American former professional boxer who competed from 1977 to 1988. He held world championships in two weight classes, including the undisputed light heavyweight title from 1983 to 1985, and the lineal heavyweight title from 1985 to 1988. As an amateur he won a gold medal in the middleweight division at the 1976 Summer Olympics.
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Audley Hugh Harrison, is a British former professional boxer who competed from 2001 to 2013. As an amateur he represented Great Britain at the 2000 Olympics, winning a gold medal in the super-heavyweight division and becoming the first ever British boxer to win Olympic gold in that division. Harrison turned professional the following year after signing a contract with BBC Sport, and went on to have seventeen fights on the network before their cancellation of all boxing broadcasts.
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Super middleweight, or light cruiserweight, is a weight class in combat sports.
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Below is a list of world heavyweight boxing championship records and statistics.