Uchiumi (内海村 Uchiumi-mura) was a village located in Minamiuwa District, Ehime, Japan. Pearl culturing flourishes here, as Uchiumi produces the highest pearl output in Japan.
On October 1, 2004 Uchiumi was merged with the towns of Ipponmatsu, Jōhen, Mishō and Nishiumi, all from Minamiuwa District, to form the new town of Ainan.
As of 2003, the village had an estimated population of 2,351 and a density of 119.10 per km². The total area was 19.74 km².