Lefkonas () is a village and a former municipality in the Serres regional unit, Greece. Since the 2011 local government reform it is part of the municipality Serres, of which it is a municipal unit. The municipal unit has an area of 68.247 km<sup>2</sup>. Population 3,534 (2021).
Near the village - on the hill of "Simitzi-bair" - the location of an ancient settlement has been found.
List of settlements in the Serres regional unit