Olonets (; ; ) is a town and the administrative center of Olonetsky District of the Republic of Karelia, Russia, located on the Olonka River to the east from Lake Ladoga. Population:

Olonets is the oldest documented settlement in Karelia, mentioned by Novgorodian sources as early as 1137. Its history is obscure until 1649, when a fortress was built there to protect the Grand Duchy of Moscow against the Swedes. The same year it was granted town privileges. Until the Great Northern War, Olonets developed as a principal market for Russian trade with Sweden. To the south from the town, there sprawled a belt of fortified abbeys, of which the Alexander-Svirsky Monastery was the most important.