Utatsu was a town located in Motoyoshi District, Miyagi Prefecture, Japan. In 2003, the town had an estimated population of 5,501 and a population density of 139.34 persons per km2. The total area was 39.48 km2. On October 1, 2005, Utatsu merged with the town of Shizugawa to create the town of Minamisanriku, and no longer exists as an independent municipality.