Cristallo is a mountain group in the Italian Dolomites, northeast of Cortina d'Ampezzo, in the province of Belluno, Veneto, northern Italy. It is a long, indented ridge with four summits higher than 3,000 metres.
Cristallo is largely formed from the Upper Triassic dolomitic rock Dolomia principale. The mountain was formed during Cretaceous, as well as the rest of the Dolomites, due to the collision between the African and European continents.
During the World War I there was considerable military activity in the mountain. The front lines between Italian and Austrian troops went through the mountains. Remains of ladders and barracks are still found today, and transport lines (ferratas) have been restored.