| Omonogawa | |
| Native Name: | 雄物川町 |
| Native Name Lang: | ja |
| Settlement Type: | Former settlement |
| Subdivision Type: | Country |
| Subdivision Name: | Japan |
| Subdivision Type1: | Prefecture |
| Subdivision Name1: | Akita |
| Subdivision Type2: | District |
| Subdivision Name2: | Hiraka |
| Unit Pref: | Metric |
| Population Density Km2: | auto |
was a town located in Hiraka District, Akita Prefecture, Japan.
In 2003, the town had an estimated population of 10,829 and a density of 147.13 persons per km2. The total area was 73.60 km2.
On October 1, 2005, Omonogawa, along with the towns of Hiraka, Jūmonji, Masuda and Ōmori; and the villages of Sannai and Taiyū (all from Hiraka District), was merged into the expanded city of Yokote.[1]