Hōjō Masako (1156 – August 16, 1225) was the eldest child of Hōjō Tokimasa by his wife Hōjō no Maki, the first shikken, or ruler, of the Kamakura shogunate. She was the sister of Hōjō Yoshitoki, and was married to Minamoto no Yoritomo, the first shogun of the Kamakura period. She was also the mother of Minamoto no Yoriie and Minamoto no Sanetomo, the second and third shoguns.