The Grünhorn (or Gross Grünhorn) (4,043 m) is a mountain in the Bernese Alps range of the Swiss Alps . It is located on the ridge between the two largest glaciers of the Alps: the Aletsch Glacier to the west and the Fiescher Glacier to the east. To the south lies the Gross Wannenhorn and, to the north, the Gross Fiescherhorn.

The starting point for the normal route via the Grünegghorn and the south-west ridge is the Konkordiahütte at 2,850 metres (9,350 ft), which can be reached from Fiesch (1,049 m; 3,442 ft).

The first ascent was made on August 7, 1865 by the Bernese mineralogist Edmund von Fellenberg with guides Peter Michel, Peter Egger and Peter Inäbnit. They climbed the mountain from the west side, starting at the Ewigschneefeld, a tributary glacier of the Aletsch Glacier.