List of boxing octuple champions*

An octuple champion in boxing refers to a boxer who has won world titles in eight different categories of weight.

Major sanctioning bodies
There is some dispute on which sanctioning body is considered "major" enough to award championships. The "Big 4" sanctioning bodies are always included. They are arranged in order of foundation:
 * World Boxing Association (WBA) - founded in 1921
 * World Boxing Council (WBC) - founded in 1963
 * International Boxing Federation (IBF) - founded in 1976
 * World Boxing Organization (WBO) - founded in 1988

The Ring
The Ring, boxing's most respected magazine that was founded in 1922, has its own version of lineal championship and began awarding championship belts in 1922. The Lineal Champion is also known as the true champion of the division. The Ring Champion holds the linear reign to the throne, the man who beat the man. The Ring stopped giving belts to world champions in the 1990s but began again in 2002.

In 2002, The Ring attempted to clear up the confusion regarding world champions by creating a championship policy. It echoed many critics' arguments that the sanctioning bodies in charge of boxing championships had undermined the sport by pitting undeserving contenders against undeserving "champions", and forcing the boxing public to see mismatches for so-called "world championships". The Ring attempted to clear up the confusion regarding world champions by creating a championship policy that is "intended to reward fighters who, by satisfying rigid criteria, can justify a claim as the true and only world champion in a given weight class." The Ring claims to be more authoritative and open than the sanctioning bodies' rankings, with a page devoted to full explanations for ranking changes. A fighter pays no sanctioning fees to defend or fight for the title at stake, contrary to practices of the sanctioning bodies. Furthermore, a fighter cannot be stripped of the title unless he loses, decides to move to a different weight division, or retires.

There are currently only two ways that a boxer can win The Ring's title: defeat the reigning champion; or win a box-off between the magazine's number-one and number-two rated contenders (or, sometimes, number-one and number-three rated). A vacant Ring championship is filled when the number-one contender in a weight-division battles the number-two contender or the number-three contender (in cases where The Ring determines that the number-two and number-three contenders are close in abilities and records).

The Ring's championship policy has gained the acceptance of television outlets in North America such as ESPN and, to an extent, HBO; it has also been mentioned by the BBC in the United Kingdom.

Minor sanctioning bodies
The minor sanctioning bodies are sometimes included. They are: International Boxing Organization (IBO), International Boxing Association (IBA), International Boxing Council (IBC), International Boxing Board (IBB), International Boxing League (IBL), International Boxing Union (IBU), Global Boxing Association (GBA), Global Boxing Council (GBC), Global Boxing Federation GBF, Global Boxing Organization (GBO), Global Boxing Union (GBU), National Boxing Association (NBA), Transcontinental World Boxing Association (TWBA), Universal Boxing Association (UBA), Universal Boxing Council (UBC), Universal Boxing Federation (UBF), Universal Boxing Organization (UBO), UNIBOX UNIBOX, United States Boxing Council (USBC), World Athletic Association (WAA), World Boxing Board (WBB), World Boxing Championship Committee (WBCC), World Boxing Empire (WBE), World Boxing Foundation (WBF), World Boxing Institute (WBI), World Boxing League (WBL), World Boxing Network (WBN), World Boxing Union (WBU), World Cup of Boxing (WCOB), World Junior Boxing Federation (WJBF), World Tournament Boxing Federation (WTBF) and the World United Boxing Association (WUBA).

Note:
 * The International Boxing Association (IBA) is not to be confused with the International Boxing Association (AIBA), a French acronym for Association Internationale de Boxe Amateur, which sanctions amateur matches.
 * The National Boxing Association (NBA) was established in 1984 and is not to be confused with the original National Boxing Association that was established in 1921 and changed its name to World Boxing Association (WBA) in 1962.

Group of Octuple Champions
The following are the lists of boxers who have won different titles in eight unprecedentedly different categories of weight.

List of Boxing Octuple or Eight Division Champions — Major Titles
This list is credited for boxers who have won championships in boxing from major sanctioning bodies and The Ring.

At present, Manny Pacquiao is the first and only boxer in history to win world titles in eight different weight divisions. Pacquiao won his first belt at 112 pounds, then he captured the crown in 122 pounds, later he won the title in 126 pounds, he got the belt at 130 pounds, the title in 135 pounds, moved up to win the crown in 140 pounds and 147 pounds and he finally won the world title at 154 pounds (although the 154-pound title match was established at a catchweight of 150 pounds).

* A catchweight of 150 pounds was established for the fight.

List of Octuple Champions (long) — Major Titles
(1) Manny Pacquiao (PHI); Belts: 112, 122, 126, 130, 135, 140, 147 & 154
 * 1st Title: 112 WBC Flyweight Title / 1998-12-04 / Chatchai Sasakul / Phuttamonthon, Thailand / KO 8 (1 successful defense)
 * 2nd Title: 122 IBF Super Bantamweight Title / 2001-06-23 / Lehlohonolo Ledwaba / Nevada, USA / TKO 6 (4 successful defenses) (vacates)
 * 3rd Title: 126 The Ring Featherweight Title / 2003-11-15 / Marco Antonio Barrera / Texas, USA / TKO 11 12 (2 successful defenses) (vacates)
 * 4th Title: 130 WBC and The Ring Super Featherweight Title / 2008-03-15 / Juan Manuel Márquez / Nevada, USA / SD 12 12 (vacates)
 * 5th Title: 135 WBC Lightweight Title / 2008-06-28 / David Díaz / Nevada, USA / TKO 9 12 (vacates)
 * 6th Title: 140 The Ring Light Welterweight Title / 2009-05-02 / Ricky Hatton / Nevada, USA / KO 2 12 (vacates)
 * 7th Title: 147 WBO Welterweight Title / 2009-11-14 / Miguel Ángel Cotto / Nevada, USA / TKO 12 12 (1 successful defense)
 * 8th Title: 154 WBC Super Welterweight Title / 2010-11-13 / Antonio Margarito / Texas, USA / UD 12/12

List of Octuple Champions (short) — Major Titles

 * (1) Manny Pacquiao (PHI); Belts: 112, 122, 126, 130, 135, 140, 147 & 154 (2010-11-13)

List of Boxing Octuple Champions — Minor + Major Titles
This list is credited for boxers who have won championships in boxing from major or minor sanctioning bodies.

The first column of the extreme left (Major titles only) refers to championships won from only major boxing entities such the WBC, WBA, IBF, WBO and The Ring.

The second column of the extreme left (minor and major titles) refers to any championships won from professional 'minor' boxing associations that are not yet well respected by the general boxing fan or public at 'world' level.

* A catchweight of 150 pounds was established for the fight.

List of Octuple Champions (long) — Minor + Major Titles
(1)(2) Manny Pacquiao (PHI); Belts: 112, 122, 126, 130, 135, 140, 147 & 154
 * 1st Title: 112 WBC Flyweight Title / 1998-12-04 / Chatchai Sasakul / Phuttamonthon, Thailand / KO 8 (1 successful defense)
 * 2nd Title: 122 IBF Super Bantamweight Title / 2001-06-23 / Lehlohonolo Ledwaba / Nevada, USA / TKO 6 (4 successful defenses) (vacates)
 * 3rd Title: 126 The Ring Featherweight Title / 2003-11-15 / Marco Antonio Barrera / Texas, USA / TKO 11 12 (2 successful defenses) (vacates)
 * 4th Title: 130 WBC and The Ring Super Featherweight Title / 2008-03-15 / Juan Manuel Márquez / Nevada, USA / SD 12 12 (vacates)
 * 5th Title: 135 WBC Lightweight Title / 2008-06-28 / David Díaz / Nevada, USA / TKO 9 12 (vacates)
 * 6th Title: 140 The Ring and IBO Light Welterweight Title / 2009-05-02 / Ricky Hatton / Nevada, USA / KO 2 12 (vacates)
 * 7th Title: 147 WBO Welterweight Title / 2009-11-14 / Miguel Ángel Cotto / Nevada, USA / TKO 12 12 (1 successful defense)
 * 8th Title: 154 WBC Super Welterweight Title / 2010-11-13 / Antonio Margarito / Texas, USA / UD 12/12

List of Octuple Champions (short) — Minor + Major Titles

 * (1)(2) Manny Pacquiao (PHI); Belts: 112, 122, 126, 130, 135, 140, 147 & 154 (2010-11-13)

Octuple Champions that skipped weight divisions

 * (1)(2) Manny Pacquiao (PHI); Belts: 112, 122, 126, 130, 135, 140, 147 & 154 (2010-11-13) — Pacquiao skipped the super flyweight (115) and bantamweight (118) divisions.

Octuple Champions that won titles in other multiple divisions
At present, no boxer in history has ever achieved to become a Nanople Champion or a boxer who has won world titles in nine different categories of weight.