Okubo Tadataka (??? ??) or Okubo Hikozaemon (??? ????) (1560 – April 2, 1639) was a Japanese warrior in the Sengoku and Edo periods.
He was the eighth son of Okubo Tadakazu, a vassal of the Tokugawa clan.
Tadataka wrote the Mikawa Monogatari (????), 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 Okubo clans.