Priory Palace is an original palace in Gatchina (Гатчина), Russia. It was built in 1799 by the architect N. A. Lvov on the shore of the Black Lake (Chyornoye ozero / Чёрное озеро). Constructed for the Russian Grand Priory of the Order of St John, it was presented to the Order by a decree of Paul I of Russia dated August 23, 1799.