Ohama Mitsutaka served as a bushō during the Sengoku period. He was a retainer of Tokugawa Ieyasu. He also had the names of Hisatarō and Minbe.
Mitsutaka was born as the son of Ohama Kagetaka, a seafaring pirate and navy admiral. Mitsutaka’s formal wife was the daughter of Naitō Kiyonari, a daimyō and retainer of Ieyasu.
Similar to his father, Mitsutaka led naval forces for Tokugawa Ieyasu, joining the Eastern Army at the Battle of Sekigahara. On 11/16 of Keichō 19 (1614), at the Winter Campaign of Ōsaka, Mitsutaka, together with Kuki Moritaka, Tsutsui Tadakatsu, and Senga Nobuchika and approximately 1,500 sailors, launched a surprise attack at the gateway to Denpō near Ōsaka, defeating the Toyotomi navy.
In 1620, he was appointed by the Edo bakufu to serve as the head of marine operations in Ōsaka, inspecting vessels owned by daimyō families to the west of Ōsaka. In 1625, Mitsutaka had Kuroda Tadayuki, the head of the Chikuzen-Fukuoka domain, prosecuted by the bakufu for violating a prohibition against the construction of large vessels.
Mitsutaka’s son, Ohama Yoshitaka, succeeded his father as the head of maritime operations, and, as a hatamoto, or direct retainer of the bakufu, held a territory of 5,000 koku. In 1609, Yoshitaka’s younger brother, Ohama Naotaka, served Tōdō Takatora, becoming a magistrate of maritime affairs.