Atsumi (温海町 Atsumi-machi) was a town located in Nishitagawa District, Yamagata, Japan.
As of 2003, the town had an estimated population of 9,921 and a density of 38.84 persons per km². The total area was 255.40 km².
On 1 October 2005, Atsumi, was merged into the expanded city of Tsuruoka, along with the towns of Fujishima, Haguro and Kushibiki, and the village of Asahi, all from Higashitagawa District, and no longer exists as an independent municipality.