Torii Tadaharu (鳥居 忠春, 1624 – September 2, 1663) was a Japanese daimyō of the early Edo period who ruled the Takatō Domain in Shinano Province (modern-day Nagano Prefecture). Tadaharu was the 3rd son of Torii Tadamasa, the lord of the Yamagata Domain. As his father died before a successor was named from among his sons, the Torii family's holdings were confiscated. However, because of his grandfather Torii Mototada's distinguished service, the family name was restored, and Tadaharu was made lord of the Takatō fief, with an income of 32,000 koku.