The quaestor sacri palatii (, usually simply ), in English Quaestor of the Sacred Palace, was the senior legal authority in the late Roman Empire and early Byzantium, responsible for drafting laws. In the later Byzantine Empire, the office of the quaestor was altered and it became a senior judicial official for the imperial capital, Constantinople. The post survived until the 14th century, albeit only as an honorary title.

Der quaestor sacri palatii (kurz QSP; lat.: „Quaestor des heiligen Palastes“) war ein hoher Beamter in der spätantiken römischen Kaiserzeit.