Avlida or Aulis a former municipality in Euboea regional unit, Greece. Since the 2011 local government reform it is part of the municipality Chalcis, of which it is a municipal unit. The population was 10,006 inhabitants at the 2021 census, and the land area is 122.235 km2. The seat of the municipality was in Vathy. Although part of the Euboea regional unit, it is not located on the island Euboea, but on the mainland, attached to the northeastern part of Boeotia.