Kasauskai is a village in Kalvarija Municipality, in Marijampolė County, Lithuania. Kasauskai lies at 108 m above sea level. It has 10 inhabitants. The nearest city is Marijampolė, 23 km to the northeast. Among the landmarks around are Puńsk synagogue (13.2 km), Church of the Assumption in Puńsk (13.4 km) and Sejny Synagogue (29 km).