Iwamuro (岩室村, Iwamuro-mura) was a village located in Nishikanbara District, Niigata Prefecture, Japan.

It was originally surrounded by lagoons and marshes before major irrigation work was undertaken in the late 19th and early 20th century.

North of the village is the Nihonkai Maze Circuit which holds regular weekend meetings throughout the summer months, attracting sports car drivers from across Japan.

Iwamuro lies on a fault zone between Yahiko mountain and the bedrock beneath the Niigata Plain.

In 2006, due to the number of onsens in the area, additional bore holes were drilled to a depth of 0.75 miles (1.21 km).

As the village is on the Niigata plain, the rich soil deposited by the Shinano and Agano River make it ideal for agriculture.

On March 21, 2005, Iwamuro, 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, Katahigashi, Nakanokuchi and Tsukigata (all from Nishikanbara District), was merged into the expanded city of Niigata.

For instance local government services have moved to Maki, Iwamuro's farming cooperative opened a new rice storage centre centralising grain collection for the entire area In April 2008 after closing six independent silos and the fishing cooperatives of Maze and Niigata city have both merged, although the fish market and boat repair yard both remain open.