| Native Name: | 新岐山 正 |
| Niigiyama Tadashi | |
| Birth Name: | Tadashi Nagano |
| Birth Date: | 5 January 1940 |
| Birth Place: | Gifu, Japan |
| Weight: | 142kg (313lb) |
| Heya: | Tokitsukaze |
| Record: | 229-205-43 |
| Debut: | March, 1955 |
| Highestrank: | Maegashira 11 (May, 1962) |
| Retireddate: | May, 1963 |
| Yushos: | 2 (Jūryō) 1 (Makushita) |
| Update: | Sep. 2012 |
Niigiyama Tadashi (born Tadashi Nagano; January 5, 1940 - September 5, 1986) was a sumo wrestler from Gifu, Japan. He made his professional debut in March 1955, and reached the top division in March 1961. He left the sumo world upon retirement from active competition in May 1963.