The IWGP World Heavyweight Championship is a professional wrestling world heavyweight championship owned by the New Japan Pro-Wrestling (NJPW) promotion. "IWGP" is the acronym of NJPW's governing body, the International Wrestling Grand Prix . The championship was created on March 1, 2021, by the unification of the IWGP Heavyweight Championship and the IWGP Intercontinental Championship. The current champion is Jon Moxley, who is in his first reign.

New Japan Pro-Wrestling (NJPW) is a Japanese professional wrestling promotion founded on January 13, 1972, by Antonio Inoki, and based in Nakano, Tokyo. It is currently owned by card game company Bushiroad, while TV Asahi and Amuse, Inc. own minority shares of the company. Naoki Sugabayashi has served as the promotion's Chairman since September 2013, while Hiroshi Tanahashi has served as the president of the promotion since December 2023.