IKO - International Karate Organization - 5th All Japan Weight Category Karate Tournament (1988)
Kumite Lightweight
| Rang | Catégorie | Champion | Pays |
| 1 | Kumite Lightweight | Takahiro Kajiwara | Japan |
| 2 | Kumite Lightweight | Taichi Nishimura | Japan |
| 3 | Kumite Lightweight | Toshhiko Imanishi | Japan |
| 4 | Kumite Lightweight | Mitsuru Sonoyama | Japan |
Kumite Middleweight
| Rang | Catégorie | Champion | Pays |
| 1 | Kumite Middleweight | Hideki Shibata | Japan |
| 2 | Kumite Middleweight | Masahiro Oga | Japan |
| 3 | Kumite Middleweight | Takuya Akimoto | Japan |
| 4 | Kumite Middleweight | Kyouichi Taguchi | Japan |
Kumite Heavyweight
| Rang | Catégorie | Champion | Pays |
| 1 | Kumite Heavyweight | Masashi Kimoto | Japan |
| 2 | Kumite Heavyweight | Takehisa Iriki | Japan |
| 3 | Kumite Heavyweight | Hirofumi Kanayama | Japan |
| 4 | Kumite Heavyweight | Yoshihiro Tamura | Japan |