Ōoka Tadasuke (born 1677, Edo [now Tokyo], Japan—died January 1752, Edo) was a highly respected Japanese judge of the Tokugawa period (1603–1867).
Appointed to office by Tokugawa Yoshimune (shogun 1716–45), Ōoka soon gained a reputation as one of the most able and incorruptible officials of the realm. As a reward, Yoshimune also appointed him the head of a small hereditary fief. Ōoka’s wisdom and fair-mindedness in arriving at decisions while serving on the bench made him a legendary figure, much celebrated in popular stories.