a town of France, capital of an arrondissement of the same name, in the department of Côtes-du-Nord, pleasantly situated on an eminence near the left bank of the Rance, 32 miles E. of St Brieuc. It is surrounded by walls of great thickness, and is defended by an old castle. The town is ill-built, and the streets are generally narrow and dirty, though some of them have lately been much improved. Dinan is the seat of a court of primary instance; and has a communal college, hospital, concert-hall, public library, and manufactures of sailcloth, cottons, hats, shoes, leather, &c. Vessels of from 70 to 90 tons come up to the town, and a considerable trade in butter, hemp, thread, &c., is carried on. Dinan is connected with Rennes by means of the canal of Ille-et-Rance. Pop. (1851) 7732.