Rubežius is a village in Trakai District Municipality, in Vilnius County, Lithuania. Rubežius lies at 154 m above sea level. It has 171 inhabitants (2021). The nearest city is Vilnius, 18.7 km to the east. Among the landmarks around are Trakai Island Castle (5.1 km), Vilnius Cathedral (18.9 km) and National Museum of Lithuania (19.0 km). Among the natural features are Tauras Hill (17.9 km) and Viktoras Bergas oak (7.0 km).