The Morbihan (/ˈmɔːrbiən/ MOR-bee-ən,[citation needed] French: [mɔʁbi(j)ɑ̃]; Breton: Mor-Bihan [moːrˈbiː(h)ãn]) is a department in the administrative region of Brittany, situated in the northwest of France.

This has been developed to include also the École militaire interarmes (inter-services military school), for non-commissioned officers; and École Militaire du Corps Technique et Administratif (military school of the technical and administrative corps).

The Morbihan, part of the region of Brittany, is surrounded by the departments of Finistère, Côtes-d'Armor, Ille-et-Vilaine, and Loire-Atlantique, and the Atlantic Ocean on the southwest.

As of 2019, there are 6 communes with more than 15,000 inhabitants:[3] Many residents support maintenance and use of the Breton language, and there are numerous advocates of bilingual education.

As of 2014, the préfet of the Morbihan is Jean-François Savy, previously head of the Prefectures of Ardennes and of Hautes-Alpes.