Ōkawachi (大河内町 Ōkawachi-chō) was a town located in Kanzaki District, Hyōgo Prefecture, Japan.
As of 2003, the town had an estimated population of 5,213 and a density of 53.65 persons per km². The total area was 97.17 km².
On November 7, 2005, Okawachi, along with the town of Kanzaki (also from Kanzaki District), was merged to create the town of Kamikawa.