Hōjō Sadatoki (北条 貞時, January 14, 1272 – December 6, 1311) was the ninth shikken (regent) of the Kamakura shogunate (reigned 1284–1301), and tokusō (de facto ruler of Japan) from his appointment as regent until his death.

Sadatoki was the son of Hōjō Tokimune, the eighth regent of the Kamakura shogunate, and Lady Horiuchi, who later became known as Kakusan-ni.

The fighting lasted five hours and Yasumori was forced to commit suicide, along with his family and many supporters.

Sadatoki's soldiers killed Taira no Yoritsuna and 90 of his followers in the Heizen Gate Incident (平禅門の乱, Heizenmon no Ran) in 1293.

A mass requiem commemorating the 12th anniversary of Sadatoki's death took place at Engaku-ji in 1323.