Koromogawa (衣川村; Koromogawa-mura) was a village located in Isawa District, Iwate, Japan.
On February 20, 2006 Koromogawa was merged with the cities of Esashi and Mizusawa, and the towns of Maesawa and Isawa, all from Isawa District, to form the new city of Ōshū.
As of 2003, the village had an estimated population of 5,049 and a density of 30.87 persons per km². The total area was 163.57 km².