Klimenets Monastery, Orthodox monastery on Bolshoy Klimenetsky Island, Russia

Klimenetsky Holy Trinity Monastery is a complex of stone and wooden churches located on the northern part of Lake Onega. The various religious structures are distributed across the island and form a multi-building ensemble with different architectural styles.

Iona Klimenetsky, a Karelian saint and son of the Novgorod posadnik Ivan Klementyev, founded the monastery in 1520 on the site of the earlier Nyatina hermitage. He had wooden Nikolsky and Trinity churches built but refused the office of abbot, remaining a simple monk until his death in 1534. Swedish raiders burned the monastery in 1613–1614; the Nikolsky church burned in 1709 and the Trinity church was rebuilt in 1712. It was abolished in 1769 and restored in 1833 by Bishop Ignatius of Olonets.

The monastery is also called after Iona Klimenetsky, the Karelian saint who founded it in 1520 and was buried in 1534 by the walls of the church of Saint Nicholas. His tomb later stood in the stone church of Saints Zachary and Elizabeth, built with funds from Empress Elizabeth. The monastery was converted into a women's convent in 1906, and nuns moved there from Kargopol.

The site is located on an island and requires a boat trip to reach it, so check access conditions beforehand. The visit works best during warmer months when weather is more stable and water crossing is easier.

The monastery stands on Bolshoi Klimetsky Island, the largest in Lake Onega. Its 1913 insurance inventory listed 27 buildings, among them the Zachary and Elizabeth church, a bell tower, the Iona Klimenetsky church, a four-sided chapel and a tower-cell in the southeast corner of the wall. The bell tower was later converted into a silo tower by the local home for invalids.