Lalín is a municipality in the north of the province of Pontevedra, in the autonomous community of Galicia, Spain. It is the capital of the comarca of O Deza. The town has a population of 20,158 inhabitants. The surface of the municipality is 326.8 km2, being the biggest municipality in the province of Pontevedra and the fourth of Galicia, with a population density of 63.85 inhabitants/km2.