Altrei (German: [alˈtraɪ]; Italian: Anterivo [anteˈriːvo]) is a comune (municipality) and a village in South Tyrol in northern Italy.

The surrounding communities of Capriana, Carano, Castello-Molina di Fiemme, and Valfloriana in the north, south and east all belong to the Trentino province, except for Truden in the northwest.

The remote area remained a Tyrolean possession until in 1779 the Habsburg empress Maria Theresa exchanged it for nearby Tramin in the Etschtal.

During the Fascist regime, Altrei from 1926 was part of the larger Capriana municipality within the Trentino province; it was again affiliated with South Tyrol according to the First Autonomy Statute of 1948.

The shield is party per fess countchanged, each part is divided into five vertical, the colors are sable and argent alternate.