Ōasa, Hiroshima

Ōasa (大朝町, Ōasa-chō^?) was a town located in Yamagata District, Hiroshima Prefecture, Japan.

As of 2003, the town had an estimated population of 3,711 and a density of 41.01 persons per km². The total area was 90.50 km².

On February 1, 2005, Ōasa, along with the towns of Chiyoda, Geihoku and Toyohira (all from Yamagata District), was merged to create the town of Kitahiroshima.