Ortler (German pronunciation: [ˈɔrtlɐ]; Italian: Ortles [ˈɔrtles]) is, at 3,905 m (12,812 ft) above sea level, the highest mountain in the Eastern Alps outside the Bernina Range . It is the main peak of the Ortler Range. It is the highest point of the Southern Limestone Alps, of South Tyrol in Italy, of Tyrol overall, and, until 1919, of the Austrian-Hungarian empire. In German the mountain is commonly referred to as "König Ortler" (King Ortler), like in the unofficial hymn of South Tyrol, the Bozner Bergsteigerlied.

The massive mountain is capped by a glacier on the northwest flank and has a long north ridge that ends at the village of Gomagoi and separates the valleys of Trafoi and Sulden. The South ridge leads to the Hochjoch (3527 m) on the main ridge of the Ortler Alps that forms the border of the Province of Sondrio and South Tyrol.