Iwaizumi is a town located in Iwate Prefecture, Japan. As of 29 February 2024, the town had a population of 8,006, and a population density of 8.1 persons per km² in 4123 households. The total area of the town is 992.36 square kilometres (383.15 sq mi).

Iwate Prefecture is a prefecture of Japan located in the Tōhoku region of Honshu. It is the second-largest Japanese prefecture at 15,275 square kilometres (5,898 sq mi), with a population of 1,165,886. Iwate Prefecture borders Aomori Prefecture to the north, Akita Prefecture to the west, and Miyagi Prefecture to the south.