Spas-Demensk () is a town and the administrative center of Spas-Demensky District in Kaluga Oblast, Russia, located on the Demena River (an arm of the Ugra)  west of Kaluga, the administrative center of the oblast.
Spas-Demensk is a town that serves as the administrative hub for Spas-Demensky District within Kaluga Oblast, Russia. It sits along the Demena River, a branch of the Ugra River, and lies west of Kaluga, which is the regional capital of the oblast.