Staroye Kvasovo () is a rural locality (a village) in Zalesskoye Rural Settlement, Ustyuzhensky District, Vologda Oblast, Russia. The population was 49 as of 2002. There are 2 streets.
Staroye Kvasovo is located southwest of Ustyuzhna (the district's administrative centre) by road. Dubrovka is the nearest rural locality.