​SONDRIO, a town of Lombardy, Italy, capital of the province of Sondrio, in the Valtellina, 1140 ft. above sea-level, on the river Adda, 26 m. E. of Lake Como and 82 m. by rail N.E. of Milan. Pop. (1901), 4425 (town); 7707 (commune). The Valtellina, of which Sondrio is the capital, produces a considerable quantity of red wine. Sondrio also has silk-works. Above the town to the north rise the snowclad peaks of the Bernina group. The railway goes on to Tirano, 16 m. farther east, from which diverge the Bernina and Stelvio roads.