Damgan (; Damgan in Breton) is a commune in the Morbihan department of Brittany in north-western France.
Damgan is a coastal town located on the south coast of Brittany. The town is located southeast of Vannes. The river Penerf forms a natural boundary to the west. Historically Damgan belongs to Vannetais and Lower Brittany.
Inhabitants of Damgan are called in French Damganais.
Damgan is a seaside resort. It is a very popular summer destination. As of 2020, 73.5% of the properties are holiday homes, the highest percentage in Morbihan.