Simnas is a town in Alytus District Municipality, in Alytus County, Lithuania. Simnas lies at 108 m above sea level. It has 1,247 inhabitants (2021). The nearest city is Alytus, 26 km to the east. Near the border: Poland, 24 km. Among the landmarks around are Prelomčiškė Hillfort (7.8 km), Church of Christ the King in Santaika (10.2 km) and Church of the Transfiguration of Jesus Christ in Meteliai (10.9 km).