Île-aux-Moines (French pronunciation: [il o mwan]; Enizenac'h in Breton; the name means island of the monks) is a commune in the Morbihan department in the region of Brittany in northwestern France.

It is in the shape of a cross and nowhere on the island lies further than 450 metres from the water.

Île-aux-Moines has been inhabited since the Neolithic period, as attested by the dolmens and other relics.

In 854, the then king of Brittany, Erispoe, gave a donation to the Abbey of Saint-Conwoïon in Redon, created by his father Nominoe.

the island was handed back to the parish of Arradon.