Lilantia () is a former municipality in Euboea, Greece. Since the 2011 local government reform it is part of the municipality Chalcis, of which it is a municipal unit. The municipal unit has an area of 111.446 km<sup>2</sup>. Population 17,172 (2021). The seat of the municipality was in Vasiliko. The municipality was named after the river Lilas or Lilantas.