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 , about 17.2% of the island's area. Its municipal seat was the town of Mýrina (pop. 5,107 at the 2001 census), 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 (Greek Orthodox bishop) of Lemnos. In addition to the town of Myrina, the municipal unit includes the communities of Káspakas (792), Platý (785), Thános (451), and Kornós (267). The 2011 census recorded 5,711 residents in the town and 8,006 residents in the municipal unit.