Ōno Harunaga (大野 治長, 1569 – June 4, 1615) was a general under Toyotomi Hideyori, and fought in the Siege of Osaka in 1615. He had become lord of Osaka castle after the battle of Sekigahara. Ono led forces against those of Wakayama Castle in the battle of Kashii and in the battle of Tennoji, where he was killed in action.