Nakanokuchi, Niigata

 was a village located in Nishikanbara District, Niigata Prefecture, Japan.
As of 2005, the village had an estimated population of 6,613 and a density of 328.03 persons per km². The total area was 20.16 km².
On March 21, 2005, Nakanokuchi, along with the cities of Niitsu, Shirone and Toyosaka, the towns of Kameda, Kosudo and Yokogoshi (all from Nakakanbara District), the town of Nishikawa, and the villages of Ajikata, Iwamuro, Katahigashi and Tsukigata (all from Nishikanbara District), was merged into the expanded city of Niigata. As of April 1, 2007, the area is now part of .
Sumo Champion.
The village is the birthplace of Haguroyama Masaji (羽黒山 政司, November 18, 1914 - October 14, 1969) who was sumo's 36th "yokozuna". Haguroyama earned the rank in May 1941 and held the title for twelve years and three months. It remains an all-time record today. 
During his career Haguroyama won seven top division championships and was runner-up on six other occasions. 
In Nakanokuchi, there is a museum dedicated to Haguroyama and a bronze statue of the famous wrestler wearing his shimenawa (the knotted rope indicating his rank as yokozuna).