St., a town of France, capital of an arrondissement in the department of Aisne, on the Somme, 87 miles N.E. of Paris. It is built on the sides and top of a hill, and surrounded by public walks, which occupy the place of the ancient fortifications. In a spacious square near the centre stands the town-hall, a handsome and richly-ornamented edifice. The cathedral, a large structure, 416 feet long in the interior, and 212 feet high, is a fine specimen of pure Gothic architecture, and has some fine painted glass in several of the windows. The town contains also a court-house, theatre, public library of 14,000 volumes, infirmary, and several hospitals. St Quentin is the centre of the manufacture of linen cloth, which is carried on extensively in the surrounding country. Cotton fabrics are also made; and there are many bleach-fields in the vicinity. The trade of St Quentin, besides the manufactures of the place, includes corn, fruits, liquorice, flax, and colonial produce. It is much facilitated by the canal of St Quentin, which unites the waters of the Oise, Somme, and Scheldt. A battle was fought under the walls of the town in 1557, between the French and the Spaniards, in which the latter gained a complete victory. Pop. (1856) 26,887.