or Ōkubo Hikozaemon (大久保 彦左衛門) (1560 – April 2, 1639) was a Japanese warrior in the Sengoku and Edo periods. He was the eighth son of Ōkubo Tadakazu, a vassal of the Tokugawa clan. Tadataka wrote the , a work he wrote for his descendants, telling the way a warrior should live, mixed with a chronicle of the accomplishments of the Tokugawa and Ōkubo clans.