Bagdononys is a village in Trakai District Municipality, in Vilnius County, Lithuania. Bagdononys lies at 127 m above sea level. It has 141 inhabitants (2021). The nearest city is Vilnius, 38 km to the east. Among the landmarks around are Trakai Island Castle (14.8 km), Basilica of the Visitation of the Blessed Virgin Mary (14.7 km) and Trakai Kenesa (14.7 km).