Lemnos or Limnos is a Greek island in the northern Aegean Sea. Administratively the island forms a separate municipality within the Lemnos regional unit, which is part of the North Aegean region. The principal town of the island and seat of the municipality is Myrina. At 477.583 square kilometres (184.396 sq mi), it is the 8th-largest island of Greece.

Myrina is a former municipality on the island of Lemnos, North Aegean, Greece. Since the 2011 local government reform it is part of the municipality Lemnos, of which it is a municipal unit. It covers the west coast of the island, and has a land area of 82.049 square kilometres (31.679 sq mi), about 17.2% of the island's area. Its municipal seat was the town of Mýrina, located in the middle of the island's west coast. The town is also the capital of Lemnos, as well as the seat of the Metropolitan of Lemnos. In addition to the town of Myrina, the municipal unit includes the communities of Káspakas, Platý, Thános, and Kornós. The 2021 census recorded 6,190 residents in the town and 8,518 residents in the municipal unit.