Dementyevskaya () is a rural locality (a village) in Spasskoye Rural Settlement, Tarnogsky District, Vologda Oblast, Russia. The population was 35 as of 2002.
Dementyevskaya is located 29 km northwest of Tarnogsky Gorodok (the district's administrative centre) by road. Grigoryevskaya is the nearest rural locality.