Plouharnel (; ) is a commune in the Morbihan department of Brittany in north-western France.
Plouharnel is a seaside town located in the south of Morbihan, southwest of Auray, southeast of Lorient and west of Vannes. The commune is bordered by Atlantic Ocean except to the north and the east. The northern part of the isthmus connecting the mainland to the ancient island of Quiberon is located in the commune's southern part.
There are two railway stations in the commune of Plouharnel, both on the AurayâÂÂQuiberon railway which is operated in summer only: Plouharnel-Carnac and Les Sables-Blancs. At Auray station connections to Paris and other places in France are offered.
Inhabitants of Plouharnel are called in French Plouharnelais.
The commune contains a number of megalithic monuments including those at Le Vieux-Moulin, comprising six stones weighing up to ten tons.