Niitsu (新津市, Niitsu-shi) was a city located in Niigata Prefecture, Japan.

The city itself was founded on January 1, 1951, but the area had already been opened to railway traffic as early as November 20, 1897.

Other cities merged into Niigata at this time include the cities of 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, Nakanokuchi and Tsukigata (all from Nishikanbara District).

[1] As of April 1, 2007, the area was part of Akiha-ku ward of Niigata City.

The Akiha hill extends to the south of the city, surrounded by plains.