Gross Seehorn, Mountain peak on Austrian-Swiss border, Silvretta Alps

Gross Seehorn is a 3,121-metre peak in the Silvretta Alps on the Austrian-Swiss border, rising in a pyramidal, slightly horn-like form. Its normal route from the Saarbrücker Hütte crosses the Seelücke (2,776 m) and continues over the west flank and uppermost northwest ridge at UIAA grades I and II. The summit is separated from the Gross Litzner by the Litzner-Hochjoch (about 2,960 m).

The mountain has been part of cross-border activities between Austrian and Swiss territories in the Silvretta region for centuries. A customs hut positioned at a high pass reflects this long history of trade and movement across the Alpine divide.

The mountain's name reflects local linguistic traditions on both sides of the border, with Austrian and Swiss climbers using distinct regional terms. This language difference represents how border communities maintain their own identities while sharing the same peaks.

The normal route starts at the Saarbrücker Hütte (DAV) and leads over the Seelücke (2,776 m), then up the west flank and the uppermost northwest ridge to the summit, graded UIAA I to II. The Gross Seehorn and the Gross Litzner, separated by the Litzner-Hochjoch (about 2,960 m), are often traversed together from east to west, graded UIAA II to III.

The Gross Seehorn is the westernmost mountain above 3,000 metres in Austria. It is separated from the Gross Litzner by the Litzner-Hochjoch at about 2,960 metres, and the two are considered the finest pair of summits in the Silvretta. A climbing peak in the Elbe Sandstone Mountains of Saxony was named after it.