Hōjō Sadatoki (北条 貞時, 14 January 1272 – 6 December 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. Born to the regent Tokimune and his wife from the Adachi family, Sadatoki became a shikken at age 14 upon the death of his father. Sadatoki was under the guardianship of .