Juodonys is a village in Širvintos District Municipality, in Vilnius County, Lithuania. Juodonys lies at 112 m above sea level. It has 33 inhabitants (2021). The nearest city is Ukmergė, 29 km to the north. Among the landmarks around are Trakai Island Castle (39 km), Kaišiadorys Cathedral (25 km) and Lithuanian Road Museum (25 km). Among the natural features are Čiobiškis cave (8.6 km).