List of undefeated world boxing 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.

Undefeated male champions

Boxer	Record (W-L-T)	Weight class (boxing)	Title(s) held	Championship years	Title defenses	Notes
Jimmy Barry[1]	61–0–10, 1NC	Bantamweight	World	1894–1899	6	Fought when the bantamweight category was not fully established. The weight limits in the United States shifted during his career.
Joe Calzaghe[2]	46–0–0	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.
			WBA, WBC	2007–2008	0
		Light heavyweight	The Ring	2008	1	Retired and vacated title.
Kim Ji-won[3]	16–0–2	Super bantamweight	IBF	1985–1986	4
Mihai Leu[4]	28–0–0	Welterweight	WBO	1997	1	Retired from boxing due to an injury.
Ricardo López[3]	51–0–1	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.[5]
			WBA	1998	0	Vacated title to move up to junior flyweight.
		Light flyweight	IBF	1999–2002	2
Rocky Marciano[3][6]	49–0–0	Heavyweight	World	1952–1956	6
Terry Marsh[3][4]	26–0–1	Light welterweight	IBF	1987	1	Retired from boxing due to epilepsy.
Floyd Mayweather Jr.[7]	50–0–0	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.
			WBA	2014–2015	3
		Light middleweight	WBC	2007, 2013–2015	1
				2012–2015
Jack McAuliffe[8]	27–0–10	Lightweight	World	1886–1893	9	Title defences consist of seven wins and two draws.
Sven Ottke[3]	34–0–0	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	Middleweight	WBO	2010–2012	3	Retired from boxing due to chronic spinal injuries.
Harry Simon[9]	31–0–0	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[9]	24–0–0	Flyweight	IBF	1992–1994	5	Retired at 21–0 and then made a comeback.
Edwin Valero[10]	27–0–0	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[11]	32–0–0	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, WBO, IBF), 0 (The Ring)

Undefeated female champions

Includes world titles from sanctioning agencies outside of WBA, WBC, WBO, IBF and outside of The Ring. Female world titles were inaugurated by the IBF, WBA, WBC, and WBO in 2010, 2004, 2005, and 2009 respectively. The Ring began awarding titles to women in 2019 and six of the fifteen weight classes are still uninaugurated (as of September 30, 2022).

Boxer	Record	Weight class	Title(s)	Championship years	Title defenses	Notes
Michele Aboro[12]	21–0–0	Super bantamweight	WIBF	2000–2001	3
Nicola Adams[13]	5–0–1	Flyweight	WBO	2019	1	Retired due to medical concerns.
Laila Ali	24–0–0	Super middleweight	IBA, WIBF	2002–2004	4 (IBA), 2 (WIBF)	Inaugural IBA women's super middleweight title.
			WIBA	2002–2007	5
			WBC	2006–2007	2	Inaugural WBC women's super middleweight title.
		Light heavyweight	WIBF	2004	0
Natascha Ragosina	22–0–0	Super middleweight	WIBF	2005–2009	10
			GBU	2006–2009	7
			WBA, WBC, WIBA	2007–2009	6 (WBA), 4 (WBC), 2 (WIBA)	Inaugural WBA women's super middleweight title.
			IWBF	2008–2009	0
		Heavyweight	WIBF, WBF	2009	0	Won the inaugural WBF women's heavyweight title in the only title fight in the division (as of September 30, 2022).
Lucia Rijker	17–0–0	Super Lightweight, Junior Welterweight	WIBF, WIBO	1997–1998	0
Kara Ro	18–0–0	Lightweight	WIBA	2005	0	Vacated title.
Wang Ya Nan	8–0–0	Middleweight	WIBA	2007–2009	3
			WBC	2008–2009	2
Seniesa Estrada	26–0–0	Mini flyweight, light flyweight, flyweight	WBC, WBA, WBO, IBF, The Ring	2018–2024	8

See also

• List of current world boxing champions
• List of current female world boxing champions
• Longest reigning heavyweight champions