Plomari is a town and a former municipality on the island of Lesbos, North Aegean, Greece. Since the 2019 local government reform it is part of the municipality Mytilene, of which it is a municipal unit. It is the only sizable coastal settlement in the south, and the second largest town on Lesbos. The municipal unit of Plomari is the southernmost on Lesbos Island and has a land area of 122.452 km2 and a 2021 census population of 4,852.