Demyansk (Russian: Демя́нск) is an urban locality (a work settlement) and the administrative center of Demyansky District of Novgorod Oblast, Russia, located along the Yavon River.

The fortress was located close to the boundary between the Novgorod Republic and the Grand Duchy of Moscow, and it was at least twice sieged by Muscovite troops.

In the 17th century, Demon went into decline, and a new settlement was founded nearby, which was known as Demyansky Pogost, and later as Demyansk.

[10] On August 1, 1927, the uyezds were abolished, and Demyansky District was established, with the center in Demyansk.

On July 5, 1944, Demyansky District was transferred to newly established Novgorod Oblast and remained there ever since.

Demyansk contains thirteen objects classified as cultural and historical heritage of local significance.