Dergionys is a village in Trakai District Municipality, in Vilnius County, Lithuania. Dergionys lies at 165 m above sea level. It has 15 inhabitants. The nearest city is Vilnius, 38 km to the east. Among the landmarks around are Trakai Island Castle (16.0 km), Basilica of the Visitation of the Blessed Virgin Mary (15.6 km) and Trakai Kenesa (15.7 km).