Arkazhsky Monastery or Annunciation Monastery (Russian: Аркажский монастырь или Благовещенский монастырь) is a Russian Orthodox monastery that was one of the most important monasteries of medieval Novgorod the Great. The monastery was founded by and takes its name from Arkadii, who founded it in 1153 prior to his being elected bishop of Novgorod (1156-1165). Other boyars, including several posadniks, helped add to the monastery over the centuries.