Hōjō Ujimasa was the fourth head of the later Hōjō clan, and daimyō of Odawara. Ujimasa succeeded the territory expansion policy from his father, Hojo Ujiyasu, and achieved the biggest territory in the clan's history.

Hōjō Ujiyasu was a daimyō (warlord) and third head of the Odawara Hōjō clan. Known as the "Lion of Sagami", he was revered as a fearsome warrior and a cunning man. He is famous for his strategies of breaking the siege from Takeda Shingen and Uesugi Kenshin. A son of Hōjō Ujitsuna, his only known wife was Imagawa Yoshimoto's sister, Zuikei-in. Among his sons are Hōjō Ujimasa and Uesugi Kagetora.