A Guarda (known in Spanish as La Guardia) is a municipality in the province of Pontevedra, in the autonomous community of Galicia, in north-western Spain. It lies within the comarca of Bajo Miño, the southernmost of Galicia's coastal districts.
The town sits at the mouth of the Miño river, which forms the border between Spain and Portugal, placing A Guarda directly opposite the Portuguese town of Caminha. This location at the river's estuary gives the municipality a stretch of Atlantic coastline and a mild, wet climate typical of Galicia.
A Guarda is best known for Monte de Santa Trega, a hill overlooking the town and the river mouth that is home to the remains of a large Castro culture settlement, one of the most significant archaeological sites of its kind in Galicia. The municipality is also a fishing port, with seafood and related industries forming a central part of its local economy.