was a city located in Akita Prefecture, Japan. The city was founded on May 3, 1954.
| Ōmagari | |
| Native Name: | 大曲市 |
| Native Name Lang: | ja |
| Settlement Type: | City |
| Image Blank Emblem: | File:Emblem of Omagari, Akita (1954–2005).svg |
| Blank Emblem Type: | Emblem |
| Pushpin Map: | Japan |
| Subdivision Type: | Country |
| Subdivision Name: |  Japan |
| Subdivision Type1: | Region |
| Subdivision Name1: | Tōhoku |
| Subdivision Type2: | Prefecture |
| Subdivision Name2: | Akita Prefecture |
| Subdivision Type3: | District |
| Subdivision Name3: | Senboku District |
| Leader Title: | Mayor |
| Area Total Km2: | 104.69 |
| Population Total: | 39,048 |
| Population As Of: | 2003 |
| Population Density Km2: | 372.99 |
| Timezone1: | Japan Standard Time |
| Utc Offset1: | +9 |
| Blank Name Sec1: | City Symbols |
| Blank2 Name Sec1: | - Merged into |
| Blank2 Info Sec1: | Daisen |
| Blank1 Name Sec2: | Address |
On March 22, 2005, Ōmagari, along with the towns of Kamioka, Kyōwa, Nakasen, Nishisenboku, Ōta and Semboku; and the village of Nangai (all from Semboku District), merged to create the city of Daisen.[1]
Juei Ushiromatsu, former New York Mets baseball pitcher