"IWGP" is the acronym of the NJPW's governing body, the International Wrestling Grand Prix (インターナショナル・レスリング・グラン・プリ, intānashonaru resuringu guran puri).

The inaugural champions were Kengo Kimura & Tatsumi Fujinami, who defeated Antonio Inoki & Seiji Sakaguchi in the final of a tournament to win the championship on December 12, 1985, at an NJPW live event.

[1] In addition to NJPW, the IWGP Tag Team Championship was also contested in the United States–based promotions World Championship Wrestling (WCW) (now defunct) in the early 1990s, and Total Nonstop Action Wrestling (TNA) in 2009,[4] and in the Mexican lucha libre promotion Consejo Mundial de Lucha Libre in 2005.

[5] On October 30, 2005, in Kobe, Japan, Hiroyoshi Tenzan & Masahiro Chono defeated Hiroshi Tanahashi & Shinsuke Nakamura to begin their fifth overall reign as a team.

[6] Shiro Koshinaka & Togi Makabe defeated the teams of Yuji Nagata & Naofumi Yamamoto and Giant Bernard & Travis Tomko in a Three-Way Match to become the first interim champions.

[11] On August 10, 2009, NJPW issued another press release stating that they were now recognizing The British Invasion of Brutus Magnus & Doug Williams as the current IWGP Tag Team Champions, making the reign official.