Yahaba is a town in Iwate Prefecture, Japan. As of 1 April 2020, the town had an estimated population of 27,227, and a population density of 400 persons per km2 in 10,131 households. The total area of the town is 67.32 square kilometres (25.99 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.