"IWGP" are the initials of 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).

[2] The title was created when the IWGP United States Heavyweight Championship was retired.

At 2023's Power Struggle, after Will Ospreay had defended the IWGP United States Heavyweight Championship against Shota Umino in the main event, Bullet Club leader David Finlay destroyed both the U.S. belt and Ospreay's custom IWGP United Kingdom Heavyweight Championship belt with a mallet after attacking Ospreay and Umino's former mentor, AEW's Jon Moxley, and a three-way match was scheduled for three men at Wrestle Kingdom 18.

The center plate features depictions of lions on each side, the "IWGP" letters in the center, and the words (all in capital letters) "Global" and "Champion" on the top and bottom, respectively; the New Japan logo is also featured on the top.

He defeated David Finlay at Wrestle Kingdom 19 in Tokyo, Japan on January 4, 2025.