Ōno was a town located in Saeki District, Hiroshima Prefecture, Japan. As of 2003, the town had an estimated population of 26,363 and a density of 372.62 persons per km2. The total area is 70.75 km2. On November 3, 2005, Ōno, along with the town of Miyajima, was merged into the expanded city of Hatsukaichi.