List of undefeated boxing world champions - wikipedia List of undefeated boxing world champions 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 Vacated title to fight Peter Manfredo Jr. instead of # 1 contender Robert Stieglitz. The Ring, lineal 2006 -- 2008 Vacated titles to move up to light heavyweight. WBA, WBC 2007 -- 2008 0 Light heavyweight The Ring 2008 Retired and vacated title. Kim Ji - won 16 -- 0 -- 2 ( 0 ) Super bantamweight IBF 1985 -- 1986 Mihai Leu 28 -- 0 -- 0 ( 0 ) Welterweight WBO Forced to retire 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. Light flyweight IBF 1999 -- 2002 Rocky Marciano 49 -- 0 -- 0 ( 0 ) Heavyweight World 1952 -- 1956 6 Terry Marsh 26 -- 0 -- 1 ( 0 ) Light welterweight IBF Forced to retire 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 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 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 Defended IBF title and defeated WBA champion to become WBA Super champion. Dmitry Pirog 20 -- 0 -- 0 ( 0 ) Middleweight WBO 2010 -- 2012 Forced to retire from boxing due to chronic back injuries. Harry Simon 30 -- 0 -- 0 ( 0 ) Light middleweight WBO 1998 -- 2001 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 Retired at 21 -- 0 and then made a comeback. Edwin Valero 27 -- 0 -- 0 ( 0 ) Super featherweight WBA 2006 -- 2008 Vacated title to move up to lightweight. Lightweight WBC 2009 -- 2010 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 ) See also Boxing portal List of current world boxing champions List of current female world boxing champions Longest reigning heavyweight champions References Jump up ^ `` Jimmy Barry ''. Cyber Boxing Zone. Retrieved December 27, 2014. Jump up ^ `` Undefeated Calzaghe quits boxing ''. BBC. February 5, 2009. Retrieved August 31, 2013. ^ Jump up to : `` US elite join race for Calzaghe ''. BBC. November 17, 2008. Retrieved August 31, 2013. ^ Jump up to : 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. Jump up ^ `` Jamili Takes Strawweight Title ''. New York Times. Retrieved December 27, 2014. Jump up ^ `` Undefeated heavyweight boxing champion, boxing ''. Guinness World Records. Retrieved August 31, 2013. Jump up ^ Undefeated Floyd Mayweather confirms retirement, Sky Sports, 13 / 09 / 2015 Jump up ^ `` Jack McAuliffe ''. Cyber Boxing Zone. Retrieved December 27, 2014. ^ Jump up to : Michael Rosenthal. `` 10 : Boxers who finished careers undefeated ''. The Ring magazine. Retrieved August 31, 2013. Jump up ^ 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. Jump up ^ Graham, Bryan Armen ( 21 September 2017 ). `` Andre Ward, boxing 's pound - for - pound world No1, announces shock retirement ''. The Guardian. Retrieved 21 September 2017. World professional boxing champions Current world boxing champions female champions Champions by sanctioning body Major world titles WBA list WBC list IBF list WBO list Other world titles The Ring list TBRB IBO list IBA WBU list Champions by weight class Heavyweight ( 200 + lb ) Cruiserweight ( 200 lb ) Light heavyweight ( 175 lb ) Super middleweight ( 168 lb ) Middleweight ( 160 lb ) Light middleweight ( 154 lb ) Welterweight ( 147 lb ) Light welterweight ( 140 lb ) Lightweight ( 135 lb ) Super featherweight ( 130 lb ) Featherweight ( 126 lb ) Super bantamweight ( 122 lb ) Bantamweight ( 118 lb ) Super flyweight ( 115 lb ) Flyweight ( 112 lb ) Light flyweight ( 108 lb ) Minimumweight ( 105 lb ) Champions in multiple weight classes Triple champions list Quadruple champions list Quintuple champions list Sextuple champions list Septuple champions list Octuple champions list Miscellaneous Lineal championship list Undisputed championship list Interim championship Pound for pound The Ring list Undefeated champions Current boxing rankings Retrieved from `` https://en.wikipedia.org/w/index.php?title=List_of_undefeated_boxing_world_champions&oldid=811950811 '' Categories : Undefeated world boxing champions Lists of boxing champions Talk About Wikipedia Add links This page was last edited on 25 November 2017, at 00 : 30. 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Question: who has the most undefeated wins in boxing
Answer: Jimmy Barry