| Native Name: | 海乃山 勇 |
| Kainoyama Isamu | |
| Birth Name: | Isamu Irii |
| Birth Date: | 28 June 1940 |
| Birth Place: | Ryūgasaki, Ibaraki, Japan |
| Weight: | 120kg (270lb) |
| Heya: | Onogawa → Dewanoumi |
| Record: | 550-496-13 |
| Debut: | May, 1955 |
| Highestrank: | Sekiwake (May, 1963) |
| Retireddate: | January, 1970 |
| Eldername: | Onogawa |
| Yushos: | 1 (Makushita) 1 (Sandanme) |
| Prizes: | Outstanding Performance (1) Fighting Spirit (2) Technique (3) |
| Goldstars: | 5 Taihō (3) Tochinoumi Kashiwado |
| Update: | June 2020 |
Kainoyama Isamu (born Isamu Irii; June 28, 1940 – July 5, 1997) was a sumo wrestler from Ryūgasaki, Ibaraki, Japan. He made his professional debut in May 1955, and reached the top division in January 1961. His highest rank was sekiwake. Upon retirement from active competition he became an elder in the Japan Sumo Association under the name Onogawa. He left the Sumo Association in September 1971.[1]