The Iwaizumi Line was a railway line in Japan, operated by the East Japan Railway Company between Moichi Station in Miyako, Iwate and Iwaizumi Station in Iwaizumi, Iwate.

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).