The Ōkubo clan (大久保氏) were a samurai kin group which rose to prominence in the Sengoku period and the Edo periods. Under the Tokugawa shogunate, the Ōkubo, as hereditary vassals of the Tokugawa clan, were classified as one of the fudai daimyō clans.

Ōkubo clan genealogy

The Ōkubo clan traces its origins to 16th century Mikawa Province. The Ōkubo claimed descent from the Utsunomiya clan, descendants of Fujiwara no Michikane (955–995). Ōkubo Tadatoshi (1499–1581) and his younger brother Ōkubo Tadakazu (1511–1583) were the first to abandon the Utaunomiya name for "Ōkubo". Both brothers were among the seven closest retainers of Matsudaira Hirotada, the father of Tokugawa Ieyasu.

Main branch

The head of this clan, Ōkubo Tadanori line was ennobled as a viscount ("shishaku") in the kazoku peerage system.

Cadet lines

Indirect Ōkubo kazoku lines