Archangel Michael's Monastery, Thasos, Greek Orthodox monastery west of Timonia, Thasos, Greece

Archangel Michael's Monastery is an Orthodox women's monastery in the south of Thasos, west of Timonia, built on a 250-metre rock above the Aegean Sea and a narrow bay. It belongs to the Athonite monastery of Philotheou and is the largest monastery on the island. Its katholikon dates from 1834, and two chapels in the lay area are dedicated to Ephrem the Syrian and Gerasimos of Cephalonia.

According to tradition, the monk Luke lived as a hermit in a cave above the sea and founded the monastery after Archangel Michael appeared to him in a dream and struck the rock, releasing a spring. The sources describe it as one of the few surviving monasteries founded in the 12th century by Athonite monks. It has been a female monastery since 1974, when it was renovated.

The monastery is a female convent, and since 1974 it has been renewed as such. Each year on the first Tuesday after Easter, a procession sets out from the village of Theologos along a pilgrim path to the monastery. In the church, airmen leave their gifts—daggers, sabres and caps—because archangels are regarded as patrons of the Greek air force.

The monastery stands west of Timonia, about 15 km from Potos, on a 250 m cliff above the Aegean; the access road winds up to it. Each year on the first Tuesday after Easter a procession sets out from the small village of Theologos along a dedicated pilgrim path to the monastery. Modest dress is expected in the church.

The monastery keeps part of the nail that pierced Christ's right hand on the cross. It was meant as a gift from Athos monks to the rulers of Moldavia, but a storm forced the bearers to stop at Thasos, taken as a sign the relic should stay.