Groix (French pronunciation: [ɡʁwa]; Breton: Enez Groe) is an island and a commune in the Morbihan department of the region of Brittany in north-western France.

The geology of Groix is distinct from that of the nearby continent, and the east and south coasts have been designated a mineral nature reserve since 1982.

[citation needed] More than 60 minerals can be found on the island, particularly blue glaucophane (observable on the surface), epidote or garnet.

[citation needed] A major naval battle between Britain and France took place off Groix in 1795.

The island is the major setting in the fourth book of The Enzo Files - 'Freeze Frame' - by author Peter May.