The Grimselpass (Passo del Grimsel) is a mountain pass in Switzerland, crossing the Bernese Alps at an elevation of 2,164 metres (7,100 ft). The pass connects the Haslital, the upper valley of the river Aare, with the upper valley of the Rhône. In so doing, and as the Aare is a tributary of the Rhine, the pass crosses the continental divide between the North Sea and the Mediterranean Sea.
The Grimsel Pass connects the cantons of Bern, to the north, and Valais, to the south, with the summit of the pass lying on the cantonal boundary. The northern slopes of the pass are in the Bernese municipality of Guttannen, whilst the southern slopes are within the Valais municipality of Obergoms.