| Native Name: | 山口 久 |
| Yamaguchi Hisashi | |
| Birth Name: | Hisashi Yamaguchi |
| Birth Date: | 16 April 1952 |
| Birth Place: | Nakatsu, Ōita, Japan |
| Weight: | 126kg (278lb) |
| Heya: | Tokitsukaze |
| Record: | 345-292-12 |
| Debut: | January, 1971 |
| Highestrank: | Maegashira 4 (March, 1979) |
| Retireddate: | November, 1982 |
| Yushos: | 1 (Jūryō) 2 (Makushita) 1 (Jonokuchi) |
| Update: | Sep. 2012 |
Yamaguchi Hisashi (born Hisashi Yamaguchi; April 16, 1952 – October 19, 2010) was a sumo wrestler from Nakatsu Ōita, Japan. He made his professional debut in January 1971 and reached the top division in May 1978. Upon his promotion he changed his shikona from his real name to Taniarashi Hisashi. His highest rank was maegashira 4. He retired in November 1982.
His son is Shun Yamaguchi, an active baseball player.