IKO - International Karate Organization - 23rd All Japan Weight Category Karate Tournament (2006)
Kumite Lightweight
| Rang | Catégorie | Champion | Pays |
| 1 | Kumite Lightweight | Yuzo Suzuki | Japan |
| 2 | Kumite Lightweight | Makoto Ozaki | Japan |
| 3 | Kumite Lightweight | Kunitomo Kondou | Japan |
| 4 | Kumite Lightweight | Akifumi Okazaki | Japan |
Kumite Middleweight
| Rang | Catégorie | Champion | Pays |
| 1 | Kumite Middleweight | Zenjyuro Mori | Japan |
| 2 | Kumite Middleweight | Tomohiko Matsuoka | Japan |
| 3 | Kumite Middleweight | Dmitriy Startsev | Russia |
| 4 | Kumite Middleweight | Takaichi Onuma | Japan |
Kumite Heavyweight
| Rang | Catégorie | Champion | Pays |
| 1 | Kumite Heavyweight | Osamu Sumitani | Japan |
| 2 | Kumite Heavyweight | Toshihiro Kanamori | Japan |
| 3 | Kumite Heavyweight | Yoshitatsu Beppu | Japan |
| 4 | Kumite Heavyweight | Tatsuya Murata | Japan |
Kumite Super Heavyweight
| Rang | Catégorie | Champion | Pays |
| 1 | Kumite Super Heavyweight | Darmen Sadvokasov | Russia |
| 2 | Kumite Super Heavyweight | Makoto Akaishi | Japan |
| 3 | Kumite Super Heavyweight | Artur Hovhannisian | Armenia |
| 4 | Kumite Super Heavyweight | Oleg Lukyanenko | Russia |