Simmental is an alpine valley in the Bernese Oberland of Switzerland. It expands from Lenk to Boltigen, in a more or less South-North direction (Obersimmental), and from there to the valley exit at Wimmis near Spiez it takes a West-East orientation (Niedersimmental). It comprises the municipalities of Lenk, St. Stephan, Zweisimmen, Boltigen, Oberwil, Därstetten, Erlenbach, Diemtigen and Wimmis. The Simme flows through the valley.
Some villages play an important role in the winter tourism of the region of Bern, such as Lenk or Zweisimmen. From Zweisimmen one can also go to the world-reputed resort of Gstaad and then to the Château-d'Œx.
Further up is the Jaunpass, which must be crossed to go from Bulle to Freiburg, as well as the Hahnenmoos, which links Lenk with Adelboden.