Kōriki Tadafusa (高力 忠房, 1584 – January 7, 1656) was a daimyō under the Tokugawa shogunate in early-Edo period Japan.
Tadafusa inherited the lordship of the Iwatsuki Domain from his grandfather in 1599, and shortly afterward, joined Tokugawa Hidetada's army for the Battle of Sekigahara, though the army did not arrive in time for the battle.
In 1614, Tadafusa was assigned to oversee the smooth transfer of Odawara Domain from the disgraced Ōkubo Tadachika to Abe Masatsugu.
Tadafusa also took part in the Siege of Osaka, and pursued the remnants of Toyotomi forces led by Doi Toshikatsu into Yamato Province .
Tadafusa was married to a daughter of Sanada Nobuyuki of Ueda Domain, and was succeeded by his son Kōriki Takanaga.