MORTAGNE, a town of France, capital of an arrondissement of the same name in the department of Orne, is situated on the summit and sides of a hill, 20 miles E. by N. of Alençon. It is well built, with a square in the centre; the principal buildings being the church, court-house, and prison. Linen, pottery, and leather are manufactured; and a considerable trade is carried on in linen, hemp, grain, and live stock. Mortagne was formerly the capital of Perche, and, from its strong position, a place of some importance. Pop. (1851) 4848.