Kvašov (Hungarian: Kvassó) is a village and municipality in Púchov District in the Trenčín Region of north-western Slovakia.
In historical records the village was first mentioned in 1471.
The municipality lies at an altitude of 252 metres and covers an area of 7.468 km². It has a population of about 660 people.
Coordinates: 49°04′N 18°13′E / 49.067°N 18.217°E / 49.067; 18.217