The Holy Monastery of Koutloumousiou (Greek: Κουτλουμούσι) is one of twenty monasteries on the Mount Athos peninsula and is located on the northeastern side of the peninsula, near Karyes. It is sixth in hierarchical rank among the monasteries.

While the existence of the monastery is confirmed by document from 1169, Koutloumousiou Monastery was founded in its present form in the 14th century. The monastery was raised with the help of voivodes Nicolae Alexandru and Vladislav Vlaicu from Wallachia.

The central church was built in 1540, but there are many chapels associated with the monastery. The most impressive of these is the chapel of the Protection of the Mother of God, built in 1733, which is at the left of the eso-narthex of the central church and contains a wonderworking icon of the Mother of God holding Christ as a child. Other chapels include St. Natalia, Ss. Kosmas and Damian, All Saints, St. John the Baptist, the Archangels and St. Spyridon.

Elder Paisios the Athonite, who lived in a cell attached to Koutloumousiou, Panagouda, between 1979 and 1996

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