Plumergat (Breton: Pluvergad) is a commune in the Morbihan department of Brittany in north-western France.

Plumergat is border by Sainte-Anne-d'Auray and Pluneret to the south.

The village of Meriadec, which has 700 inhabitants, is divided in two between Pluneret and Plumergat.

Inhabitants of Plumergat are called in French Plumergatais.

In 2011, 6.6% of the children attended the bilingual schools in primary education.