The Dammastock (3,630 m) is the highest mountain in the Urner Alps in Switzerland and is part of the Winterberg massif.

Its summit ridge forms the border between the cantons of Uri and the Valais.

The tripoint between the cantons of Bern, Valais and Uri lies near the Eggstock, north of the Dammastock.

Politically, the Dammastock is split between the municipalities of Göschenen (Uri) and Obergoms (Valais).

It was first climbed by Albert Hoffmann-Burkhardt with guides Johann Fischer and Andreas von Weissenfluh on 28 July 1864.