Harunaga Ono (1569-4 June 1615) was a general of the Toyotomi clan who was the lord of Osaka Castle after the Battle of Sekigahara. He gave refuge to Hideyori Toyotomi and fought in the Osaka Campaign of 1615. When a fire attack was launched by the Tokugawa against his castle, he was weakened and wsa killed by Tokugawa infantrymen.