13th All-Japan Open Championship in Kyokushin (IKO), 1981
Winners
- Keiji Senpai — Japan
- Makoto Nakamura — Japan
- Akiyoshi Matsui — Japan
- Masayuki Shiraishi — Japan
- Kazuo Miyoshi — Japan
- Masafumi Tanaka — Japan
- Harutomo Takeyama — Japan
- Masatosi Maeda — Japan