IMGP World Heavyweight Championship
The IMGP World Heavyweight Championship is an inactive professional wrestling championship in the Japanese promotion Muscle, a sub-brand of DDT Pro-Wrestling. IMGP is the acronym of International Muscle Grand Prix and a parody of New Japan Pro-Wrestling's governing body, the International Wrestling Grand Prix.
The championship was introduced in late 2006 and has been represented by a belt resembling the second IWGP Heavyweight Championship design. Since Atsushi Maruyama won the title in 2015, it has never been defended nor has it been officially deactivated.
Combined reigns
| Rank | Wrestler | No. of reigns | Combined defenses | Combined days |
| 1 | † | 2 | 0 | ¤+ |
| 2 | 1 | 1 | 322 | |
| 3 | 1 | 1 | 243 | |
| 4 | 1 | 0 | 125 | |
| 5 | 1 | 0 | 121 | |
| 6 | 1 | 0 | 96 |