The World Wrestling Federation (WWF) World Martial Arts Heavyweight Championship was a world heavyweight championship in the World Wrestling Federation (WWF) and later in New Japan Pro Wrestling (NJPW). It was created on December 18, 1978, and awarded to NJPW mainstay Antonio Inoki by Vincent J. McMahon, upon Inoki's arrival to the promotion. The title was known for being contested in shoot wrestling fights. The WWF World Martial Arts Heavyweight Championship was contested only in NJPW after the promotion became unaffiliated with the WWF in 1985.
During the thirtieth anniversary of Inoki's career, NJPW created the "Greatest 18 Club", a hall of fame. NJPW then created a new title, the Greatest 18 Championship, which was intended to complement the IWGP Heavyweight Championship. The Greatest 18 Championship was represented by the former Martial Arts Championship and was awarded to Riki Chōshū in 1990. Chōshū lost the title to The Great Muta in 1992. Muta retired the title on September 23, in order to focus on his IWGP Heavyweight Championship title defenses. The title was subsequently officially retired by NJPW.