IKO - International Karate Organization - 20th All Japan Weight Category Karate Tournament (2003)
Kumite Lightweight
| Rang | Catégorie | Champion | Pays |
| 1 | Kumite Lightweight | Osamu Shiojima | Japan |
| 2 | Kumite Lightweight | Atsushi Ono | Japan |
| 3 | Kumite Lightweight | Takahiro Fukuda | Japan |
| 4 | Kumite Lightweight | Hiroyuki Owatari | Japan |
Kumite Middleweight
| Rang | Catégorie | Champion | Pays |
| 1 | Kumite Middleweight | Toshihiro Kanamori | Japan |
| 2 | Kumite Middleweight | Hisashi Noka | Japan |
| 3 | Kumite Middleweight | Joji Hibino | USA |
| 4 | Kumite Middleweight | Shin Ito | Japan |
Kumite Heavyweight
| Rang | Catégorie | Champion | Pays |
| 1 | Kumite Heavyweight | Masato Ikeda | Japan |
| 2 | Kumite Heavyweight | Yoshinori Ikeda | Japan |
| 3 | Kumite Heavyweight | Masataka Ino | Japan |
| 4 | Kumite Heavyweight | Naoji Mikoshiba | Japan |
Kumite Super Heavyweight
| Rang | Catégorie | Champion | Pays |
| 1 | Kumite Super Heavyweight | Hirokazu Kondo | Japan |
| 2 | Kumite Super Heavyweight | Norihito Satoh | Japan |
| 3 | Kumite Super Heavyweight | Shinji Adachi | Japan |
| 4 | Kumite Super Heavyweight | Masaki Takao | Japan |