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.
| Boxer | Record | Weight class (boxing) | Title(s) held | Championship years | Notes | |
|---|---|---|---|---|---|---|
| [1] | 59–0–9, 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. |
| [2] | 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. | ||
| 16–0–2 | Super bantamweight | IBF | 1985–1986 | 4 | ||
| [3] | 28–0–0 | Welterweight | WBO | 1997 | 1 | Retired from boxing due to an injury. |
| [4] | 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 | |||
| [6] | 49–0–0 | Heavyweight | World | 1952–1956 | 6 | |
| 26–0–1 | Light welterweight | IBF | 1987 | 1 | Retired from boxing due to epilepsy. | |
| [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. | ||
| WBC | 2005–2006 | 0 | Vacated title to move up to 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 | ||||
| WBC | 2007, 2013–2015 | 1 | ||||
| WBA | 2012–2015 | 1 | ||||
| [8] | 27–0–10 | Lightweight | World | 1886–1893 | 9 | Title defences consist of seven wins and two draws. |
| 34–0–0 | 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. |
| [9] | 31–0–0 | 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. | ||
| 24–0–0 | Flyweight | IBF | 1992–1994 | 5 | Retired at 21–0 and then made a comeback. | |
| [10] | 27–0–0 | 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. | ||
| [11] | 32–0–0 | WBA | 2009–2015 | 6 | Vacated titles in 2015 to move up to light heavyweight. | |
| WBC, The Ring | 2011–2015 | 1 (WBC), 2 (The Ring) | ||||
| WBA, WBO, IBF, The Ring | 2016–2017 | 1 (WBA, WBO, IBF), 0 (The Ring) |
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 | Title(s) | Notes | |||
|---|---|---|---|---|---|---|
| [12] | 21–0–0 | Super bantamweight | WIBF | 2000–2001 | 3 | |
| [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). | ||
| Kara Ro | 17–0–0 | Lightweight | WIBA | 2005 | 0 | Vacated title. |
| Wang Ya Nan | 8–0–0 | Middleweight | WIBA | 2007–2009 | 3 | |
| WBC | 2008–2009 | 2 | ||||
| Lucia Rijker | 17–0–0 | Super Lightweight, Junior Welterweight | WIBF, WIBO | 1997–1998 | 0 | |