A cloistered emperor (太上法皇, daijō hōō; also pronounced dajō hōō) is the term for a Japanese emperor who had abdicated and entered the Buddhist monastic community by receiving the Pravrajya rite. The term can also be shortened to Hōō (法皇; lit. "Dharma emperor").

Cloistered emperors sometimes acted as Daijō Tennō (retired emperors), therefore maintaining effective power. This title was first assumed by Emperor Shōmu and was later used by many other emperors who "took the tonsure", signifying a decision to become a Buddhist monk. The last cloistered emperor was Emperor Reigen (r. 1663-1687) in the Edo period.