Ktuts monastery (Armenian: Կտուց, meaning beak in Armenian) is an abandoned 15th century Armenian monastery on the small island of Ktuts (Çarpanak) in Lake Van, Vaspurakan (present-day Turkey). According to tradition, the monastery was founded in the 4th century by Saint Gregory the Illuminator, after his return from Rome. It contained a hand of John the Baptist, which was kept in a reliquary now held at the Armenian Patriarchate of Jerusalem.