IKO - International Karate Organization - 1st All Japan Weight Category Karate Tournament (1984)
Kumite Lightweight
| Rang | Catégorie | Champion | Pays |
| 1 | Kumite Lightweight | Masahiro Oga | Japan |
| 2 | Kumite Lightweight | Tatsumi Nakae | Japan |
| 3 | Kumite Lightweight | Haruo Nakijima | Japan |
| 4 | Kumite Lightweight | Singo Thiba | Japan |
Kumite Middleweight
| Rang | Catégorie | Champion | Pays |
| 1 | Kumite Middleweight | Hideaki Kakinuma | Japan |
| 2 | Kumite Middleweight | Mitsuaki Satoh | Japan |
| 3 | Kumite Middleweight | Satoshi Yui | Japan |
| 4 | Kumite Middleweight | Hiroshi Inoaka | Japan |
Kumite Heavyweight
| Rang | Catégorie | Champion | Pays |
| 1 | Kumite Heavyweight | Yasuhiro Shichinohe | Japan |
| 2 | Kumite Heavyweight | Yoshitaka Nishiyama | Japan |
| 3 | Kumite Heavyweight | Shinichi Sotodate | Japan |
| 4 | Kumite Heavyweight | Hirofumi Kanayama | Japan |