IWGP Heavyweight Championship

IWGP Heavyweight Championship (1987–2021; 2026–present)

An early version of this championship was introduced as the prize of the 1983 IWGP League (which later evolved into the G1 Climax), which was won by Hulk Hogan. In 1984 and 1985, the winner of the IWGP League instead earned the right to challenge for the championship at the conclusion of the tournament, and in 1986, then-champion and company founder Antonio Inoki vacated the championship in order to compete in that year's tournament. In 1987, this version of the championship was deactivated and the winner of that year's tournament, Inoki, was recognized as the inaugural IWGP Heavyweight Champion.^[6] His student, Tatsumi Fujinami, who had become NJPW's first homegrown star,^[7] won the championship after Inoki had an injury in 1988, after defeating one of Inoki's main rivals in the American Big Van Vaderin May 1988.^[8] After Fujinami and Riki Choshu had fought to a no contest that same month,^[9] the title was vacated pending an immediate rematch for the title, which Fujinami won in June.^[10] Choshu, Fujinami, and Vader traded the championship from 1989 until 1992 (with the exception of Salman Hashimikov, who won the title from Vader in 1989, and lost it to Choshu later).

Keiji Muto, as his Great Muta persona, was the first of the Toukon Sanjushi, or Three Musketeers of NJPW, to win the championship, when he defeated Riki Choshu in Fukuoka in 1992. In the same match, he gained Choshu's Greatest 18 Club Championship, which retired afterward.^[11] In his championship reign, he assumed the longest up to that point at 400 days; he lost the belt to a fellow Musketeer, Shinya Hashimoto, in September 1993.^[12] Muto won the championship again in 1995, during the invasion by UWF International. After UWFi founder and ace Nobuhiko Takada won the belt off Muto at Wrestling World 1996,^[13] Hashimoto gained the title from the invading Takada, and put an end to the rivalry.^[14][15]

In the early 2000s, Inoki saw the rise of several mixed-martial-arts or hybrid-MMA/pro-wrestling stars to become IWGP Heavyweight Champions. The first was Kazuyuki Fujita in 2001, which was followed afterward (after Fujita suffered an injury) by Tadao Yasuda.^[16] Yoshihiro Takayama,^[17] Yuji Nagata^[18] and Shinsuke Nakamura,^[19] who were trained wrestlers that did MMA consecutively, also won the title during this period; the latter, Nakamura, became the youngest IWGP Heavyweight Champion at the age of 23. After Bob Sapp won the title and Fujita had his second and third reigns, this style of booking was dropped.

As part of a storyline between 2003-2004, NJPW recognized the previously-established NWF Heavyweight Championship as the second primary heavyweight championship in the company, which was unified after IWGP champion Shinsuke Nakamura defeated NWF champion Yoshihiro Takayama at Wrestling World 2004.^[6][20][19] In July 2006, Brock Lesnar was stripped of the title after he refused to defend it, claiming he was owed money by NJPW. The company proceeded to crown a new champion, while Lesnar kept the physical belt.^[21] He signed with Antonio Inoki's Inoki Genome Federation (IGF) in 2007, and lost the championship to Kurt Angle at the promotion's inaugural event.^[22][23] Angle, who was recognized by his home promotion Total Nonstop Action Wrestling (TNA) as the "IWGP Heavyweight Champion" and by NJPW as the "IWGP 3rd Belt Champion",^[24] lost the IGF title in a unification match to the NJPW-recognized Heavyweight Champion Shinsuke Nakamura in February 2008.^[25]

In the midst of a one year reign as champion, NJPW ace Hiroshi Tanahashi was challenged by the recently-returned Kazuchika Okada. A change in booking was made apparent by Okada winning the championship from Tanahashi, as Bushiroad had just bought NJPW for ¥500 million and Gedo assumed the role as head booker of NJPW.^[26][27][28] Okada and Tanahashi traded the championship with themselves and others, with a break in-between for wrestlers like AJ Styles and Tetsuya Naito, who had also became popular established stars.^[29] Between 2012 and 2018, there were no unsuccessful championship defenses that took place at the January 4th Tokyo Dome event (Wrestle Kingdoms VI through 12). Within 2016 to 2018, Kazuchika Okada had, in his fourth overall reign, the longest reigning (720 days) and the most successfully-defense championship (twelve defenses) reign of the title, which began with a win against the incumbent Tetsuya Naito at Dominion 6.19, and ended with a loss to Kenny Omega at Dominion 6.9 (both at Osaka-jō Hall).^[30]

In 2019, when he was IWGP Intercontinental Champion, Tetsuya Naito declared his intention of making history by becoming the first to hold the IWGP Heavyweight and Intercontinental Championship at the same time.^[31] By the end of the year, Jay White, who had won the Intercontinental Championship from Naito, and Kota Ibushi, who was the next challenger for the Heavyweight Championship, also expressed the same desire. After a fan vote, it was decided that Naito, White, Ibushi, and Heavyweight Champion Kazuchika Okada would compete at Wrestle Kingdom 14 on January 4–5, 2020, where one would end up with both titles.^[32] Naito achieved the feat to become the first "Double Champion" and the two titles were defended together since (apart from one time). During 2020, Naito said his original intention was for the titles to be defended separately. He requested for this, or otherwise for the titles to be unified, but no change happened.^[33] Both titles kept their individual history, but were defended at the same time and were sometimes referred to as the "Double Championship".^[34][35]

IWGP World Heavyweight Championship (2021–2026)

After Ibushi won the titles from Naito at Wrestle Kingdom 15 on January 4, 2021, he expressed his desire for the titles to be unified.^[36] On March 1, 2021, with Ibushi still champion, the unification of the titles to create the new IWGP World Heavyweight Championship was officially announced, with Ibushi as the inaugural World Heavyweight Champion. After the announcement, Ibushi, who was scheduled to face then-IWGP Junior Heavyweight Champion El Desperado at the NJPW 49th Anniversary Show on March 4, 2021 in a non-title match, requested for the match to be for both belts to determine the first World Heavyweight Champion.^[37][38] Ibushi won the match, and the new belt was eventually revealed and presented on March 30, 2021.^[39] Its design incorporated the past belt designs of the two old titles.^[40] The design also drew a negative reaction from fans and commentators, the Last Word on Sports citing its unusual shaped front plate as a reason for its unpopularity. While champion, Ibushi noted the negative reaction in interviews.^[41][42]

Unusually for a unification, during the time the World Heavyweight Championship was active, NJPW considered both the Heavyweight Championship and the Intercontinental Champion deactivated, with the World Heavyweight Championship using a brand new lineage rather than continuing one of the belts' history.^[43] As part of a storyline in late 2021, Kazuchika Okada was awarded the old Heavyweight Championship belt after defeating Ibushi in that year's G1 Climax final. He carried the championship as is to replace the typical briefcase that was used for the contendership of the championship, which was custom^[44] After defeating then-champion Shingo Takagi at Wrestle Kingdom 16, he elected to be recognized as the World Heavyweight Champion instead of reviving the Heavyweight Championship.^[45]

At Wrestle Kingdom 20 in January 2026, Yota Tsuji defended the IWGP Global Heavyweight Championship against incumbent IWGP World Heavyweight Champion Konosuke Takeshita in a double-title match. Tsuji defeated Takeshita and proclaimed himself the IWGP Heavyweight Champion both in the post-match in-ring promo, and at New Year Dash!! a day later, stating that the World title was "cursed".^[46] In accordance with his wishes, NJPW revived the IWGP Heavyweight Championship V4 belt, reactivating it's and the IWGP Intercontinental Championship's lineages, and combined said lineages with the World Heavyweight Championship. As a result, all former World Heavyweight Champions were retroactively recognized as former Heavyweight Champions, along with having been former IWGP Intercontinental Champions, and Tsuji was recognized as the 87th IWGP Heavyweight Champion.^[47]