Ōno (大野町, Ōno-chō) 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 (also from Saeki District), was merged into the expanded city of Hatsukaichi.