Seiser Alm (Italian: Alpe di Siusi, Ladin: Mont Sëuc) is a Dolomite plateau and the largest high-elevation Alpine meadow (German: Alm) in Europe.

Located in Italy's South Tyrol province in the Dolomites mountain range, it is a major tourist attraction, notably for skiing and hiking.

It is located in the western part of the Dolomites and has an elevation between 1,680 meters (5,510 ft) and 2,350 meters (7,710 ft); it extends for 52 square kilometers (20 sq mi) between Val Gardena to the north, the Sassolungo Group to the northeast, and the Sciliar massif to the southeast, which with its unmistakable profile is one of the best-known symbols of all the Dolomites.

It is divided into numerous plots reserved to grazing or from which farmers obtain hay for their farms at lower elevations.

In the Bronze Age, people began to use the forest as grazing land for cattle.