was a retainer of the Japanese Hà Âjà  clan and an early daimyà  of Shimà Âsa Province. Harutomo was the son of Oyama Takatomo and was adopted by his uncle Yà «ki Masakatsu.
Harutomo ultimately accepted the authority of the Hà Âjà Â, but his ties were severed when Toyotomi Hideyoshi besieged the Hà Âjà  castle of Odawara. Harutomo later adopted the 2nd son of the famous Tokugawa Ieyasu, Hideyasu, whom he later accompanied to the province of Echizen following the year of 1600.