Ōmagari, Akita 大曲市
（重定向自Omagari）
Ōmagari(大曲市,Ōmagari-shi) was a city located in Akita Prefecture, Japan.
In 2003, the city had an estimated population of 39,048 and a density of 372.99 persons per km². The total area was 104.69 km².
On March 22, 2005, Ōmagari, along with the towns of Kamioka, Kyōwa, Nakasen, Nishisenboku, Ōta and Semboku; and the village of Nangai (all from Senboku District), merged to create the city of Daisen.