Valtellina or the Valtelline (occasionally spelled as two words in English: Val Telline); German: Veltlin, Italian: Valtellina, (Lombard: Valtulina, Romansh: Vuclina) is a valley in the Lombardy region of northern Italy, bordering Switzerland. Today it is known for its ski center, hot spring spas, bresaola, cheeses (in particular Bitto, named after the river Bitto) and wines. In past centuries it was a key alpine pass between northern Italy and Germany and control of the Valtellina was much sought after, particularly during the Thirty Years' War.
The most important comune of the valley is Sondrio; the others major centers are Aprica, Morbegno, Tirano, Bormio and Livigno. Although Livigno is on the northern side of the alpine watershed, it is considered part of Valtellina as it falls within the province of Sondrio.
During the 16th, 17th and 18th centuries, the Valtellina belonged to Graubünden (the "Grey Leagues"), which was then a mutual-defense region independent of Switzerland but is now the easternmost Swiss Canton. Graubünden is an area in which German, Romansh, Lombard and Italian are all spoken, and hence during 16th century rule by Graubünden, the region became known variously as Veltlin, Westtirol (West Tyrol), and the Welsche Vogteien ("Romanic Bailiwicks").