The Monterosa Ski is an Italian ski resort, at the foot of Monte Rosa the second tallest mountain in the Alps , which links three valleys, located largely in the Aosta Valley and the remainder in Piedmont . Much of the area consists of easy and intermediate skiing, but the area around the Passo dei Salati and especially the steep slopes in Alagna Valsesia are a major and very famous destination for freeride skiers and snow-boarders.

The area takes its name from the huge and spectacular Monte Rosa massif as the heads of its three constituent valleys are located within this group. These valleys are the Val d'Ayas and the Lys Valley, located within the Aosta Valley, and Alagna Valsesia in the Valsesia Valley, in Piedmont.

The connections between the valleys are at the Bettaforca Pass (Ayas and Lys), and the Passo dei Salati (Lys and Valsesia). These connections are susceptible to closure in the case of high winds.