Houat (Breton: Enez Houad; French: Île d'Houat, French pronunciation: [il dwat]) is a French island off the south coast of Brittany in the department of Morbihan.

It is located, along with two other major islands, in the entrance to the Baie de Quiberon.

Administratively, Île-d'Houat is a commune of the Morbihan department.

The island is mostly granite cliffs except for a long beach lined with dunes on the eastern coast.

Houat is the setting for Iain Pears' 2005 novel The Portrait.