|Antonio Inoki||June 12, 1987||Tokyo, Japan||-a-|
|Tatsumi Fujinami||May 8, 1988||Tokyo, Japan||-b-|
|Tatsumi Fujinami ||June 24, 1988||Osaka, Japan||-c-|
|Big Van Vader||April 24, 1989||Tokyo, Japan||-d-|
|Salman Hashimikov||May 25, 1989||Osaka, Japan|
|Riki Choshu||July 12, 1989||Osaka, Japan|
|Big Van Vader ||August 10, 1989||Tokyo, Japan|
|Riki Choshu ||August 19, 1989||Tokyo, Japan|
|Tatsumi Fujinami ||December 26, 1990||Hamamatsu, Japan|
|Big Van Vader ||January 17, 1991||Yokohama, Japan|
|Tatsumi Fujinami ||March 4, 1991||Hiroshima, Japan|
|Riki Choshu ||January 4, 1992||Tokyo, Japan|
|The Great Muta (Keiji Mutoh)||August 16, 1992||Fukuoka, Japan|
|Shin'ya Hashimoto||September 20, 1993||Nagoya, Japan|
|Tatsumi Fujinami ||April 4, 1994||Hiroshima, Japan|
|Shi'ya Hashimoto ||May 1, 1994||Fukuoka, Japan|
|Keiji Mutoh ||May 3, 1995||Fukuoka, Japan|
|Nobuhiko Takada||January 4, 1996||Tokyo, Japan|
|Shin'ya Hashimoto ||April 29, 1996||Tokyo, Japan|
|Kensuke Sasaki||August 31, 1997||Yokohama, Japan|
|Tatsumi Fujinami ||April 4, 1998||Tokyo, Japan|
|Masahiro Chono||August 8, 1998||Osaka, Japan||-e-|
|Scott Norton||September 23, 1998||Yokohama, Japan||-f-|
|Keiji Mutoh ||January 4, 1999||Tokyo, Japan|
|Genichiro Tenryu||December 10, 1999||Osaka, Japan|
|Kensuke Sasaki ||January 4, 2000||Tokyo, Japan||-g-|
|Kensuke Sasaki ||January 4, 2001||Tokyo, Japan||-h-|
|Scott Norton ||March 17, 2001||Nagyoa, Japan|
|Kazuyuki Fujita||April 9, 2001||Osaka, Japan||-i-|
|Tadao Yasuda||February 16, 2002||Tokyo, Japan||-j-|
|Yuji Nagata||April 5, 2002||Tokyo, Japan|
|Yoshihiro Takayama||May 2, 2003||Tokyo, Japan||-k-|
|Hiroyoshi Tenzan||November 3, 2003||Yokohama, Japan|
|Shinsuke Nakamura||December 9, 2003||Osaka, Japan||-l-|
|Hiryoshi Tenzan ||February 15, 2004||Tokyo, Japan||-m-|
|Kensuke Sasaki ||March 12, 2004||Tokyo, Japan|
|Bob Sapp||March 28, 2004||Tokyo, Japan||-n-|
|Kazuyuki Fujita ||June 5, 2004||Osaka, Japan||-o-|
|Kensuke Sasaki ||October 9, 2004||Tokyo, Japan|
|Hiroyoshi Tenzan ||December 12, 2004||Nagoya, Japan|
|Satoshi Kojima||February 20, 2005||Tokyo, Japan||-p-|
|Hiroyosji Tenzan ||May 14, 2005||Tokyo, Japan|
|Kazuyuki Fujita ||July 18, 2005||Sapporo, Japan|
|Brock Lesnar||October 8, 2005||Tokyo, Japan||-q-|
|Hiroshi Tanahashi||July 17, 2006||Sapporo, Japan||-r-|
|Yuji Nagata ||April 13, 2007||Osaka, Japan|
|Hiroshi Tanahashi ||October 8, 2007||Tokyo, Japan|
|Shinsuke Nakamura ||January 4, 2008||Tokyo, Japan|
|Keiji Mutoh ||April 27, 2008||Osaka, Japan|
-a- Defeated Masa Saito in the final of the 1987 IWPG Tournament to become the first champion. Vacated on May 2, 1988 after Inoki breaks his foot.
-b- Defeated Big Van Vader for the vacant belt. Held-up after a May 27, 1988 match against Riki Choshu ends in a no-contest.
-c- Defeated Choshu in a rematch. Vacated on April 5, 1989.
-d- Defeated Shin'ya Hashimoto in the finals of an 8-man, one night only tournament for the vacant title.
-e- Vacated on September 21, 1998 after Chono suffers a severe neck injury.
-f- Defeated Yuji Nagata for the vacant belt.
-g- Vacated on October 9, 2000 after a losing a non-title match to Toshiaki Kawada.
-h- Defeated Kawada in the finals of a tournament to regain the vacant belt.
-i- Vacated in December 2001 after Fujita is unable to defend the belt due to injury.
-j- Defeated Yuji Nagata in the finals of a tournament for the vacant belt.
-k- Also holds the NWF World Heavyweight Title.
-l- Defeated Yoshihiro Takayama, who is the NWF World Heavyweight Champion, to unify the NWF title into the IWGP title. Vacated in January 2004 due to injury.
-m- Defeated Genichiro Tenryu in the finals of a tournament to win the vacant title.
-n- Vacated in May 2004 when Sapp leaves the country.
-o- Defeated Hiroshi Tanahashi with in the vacant belt.
-p- Kojima is also the All-Japan Triple Crown Champion at the time of this title change.
-q- Stripped on July 15, 2006 when Lesnar does not return to Japan to defend due to a contractual problem.
-r- Defeated Giant Bernard in the finals of a tournament to win the vacant belt.