Mas Oyama
| Masutatsu Oyama (Choi Bae-dal) | |
|---|---|
Oyama in 1954  | |
| Born | Choi Yeong-eui 27 July 1923 Kintei, Zenrahoku-dō, Korea, Empire of Japan (now Gimje, North Jeolla Province, South Korea)  | 
| Died | 26 April 1994 (aged 70) Tokyo, Japan  | 
| Height | 173 cm (5 ft 8 in) | 
| Style | Kyokushin | 
| Teacher(s) | Gigō Funakoshi, Gōgen Yamaguchi, Nei-Chu So | 
| Rank | 10th Dan Black Belt in Kyokushin Karate | 
| Other information | |
| Spouse | Chiyako Oyama (1946–1994) | 
| Children | 3 | 
| Notable students | (see below) | 
| Choi Bae-dal | |
| Hangul | 최배달  | 
|---|---|
| Hanja | |
| Revised Romanization | Choe Baedal | 
| McCune–Reischauer | Ch'oe Paetal | 
| Kyokushin | |
| Hangul | 극진  | 
|---|---|
| Hanja | |
| Revised Romanization | Geukjin | 
| McCune–Reischauer | Kŭkchin | 
Masutatsu Ōyama (大山 倍達, Ōyama Masutatsu; 27 July 1923 – 26 April 1994), more commonly known as Mas Oyama, was a Zainichi Korean karate master who founded Kyokushin Karate, considered the first and most influential style of full contact karate.