Ōmori (大森町, Ōmori-machi) was a town located in Hiraka District, Akita Prefecture, Japan.

In 2003, the town has an estimated population of 7,757 and a density of 75.88 persons per km2.

The total area was 102.23 km2.

On October 1, 2005, Ōmori, along with the towns of Hiraka, Jūmonji, Masuda and Omonogawa; and the villages of Sannai and Taiyū (all from Hiraka District), was merged into the expanded city of Yokote.

This Akita Prefecture location article is a stub.