Gavrinis (Breton: Gavriniz) is a small island, situated in the Gulf of Morbihan in Brittany, France. It contains the Gavrinis tomb, a megalithic monument notable for its abundance of megalithic art in the European Neolithic. Administratively, it is part of the commune of Larmor-Baden.
Reachable by boat from the town of Larmor-Baden, the island of Gavrinis is uninhabited. Located near the opening of Morbihan Gulf to the Atlantic Ocean, the island is basically a granite rock outcrop of 750 x 400m dimensions. Its highest point dominates much of the surrounding area.
The name Gavrinis is popularly believed to be derived from the Breton words gavr (goat) and enez (island), thus suggesting a meaning as "goat island". This is probably a false etymology. In documents dating to 1184 and 1202, the island is named as Guirv Enes and Guerg Enes, respectively. The old Breton word Guerg is not related to gavr, but to parallels like Gaul gwery, or Old Irish ferg, signifying "wrath".
The island is famous because of its important passage grave, a megalithic monument from the Neolithic period, belonging to the same broad context as the Breton megaliths of Carnac and Locmariaquer, and closely connected with the monuments at Brú na Boínne (Ireland) and Maes Howe (Orkney). At the time of its construction, c. 3500 BC, the island was still connected with the mainland. The rich internal decorations make Gavrinis one of the major treasuries of European megalithic art. The tomb is also remarkable for the care taken in its construction and its good preservation.