was a town located in Yamamoto District, Akita Prefecture, Japan.
As of 2003, the town has an estimated population of 5,819 and a density of 52.24 persons per km<sup>2</sup>. The total area is 111.38 km<sup>2</sup>.
On March 20, 2006, Kotooka, along with the towns of Hachiryà « and Yamamoto (all from Yamamoto District), was merged to create the town of Mitane.