Vermio () is a former municipality in the Kozani regional unit of West Macedonia, Greece. Since the 2011 local government reform, it is part of the municipality Eordaia, of which it is a municipal unit. The municipal unit has an area of 187.153 km<sup>2</sup>. In 2021, it had a total population of 2,328 permanent inhabitants. The seat of the municipality was in Komnina.