The Sarine (French: [saʁin]; Arpitan: Sarena [ʃaʁˈnɑ] ) or Saane (German: [ˈzaːnə]) is a major river of Switzerland. It is 128 km (80 mi) long and has a drainage area of 1,892 km2 (731 sq mi). It is a tributary of the Aare .

The Sarine rises in the Bernese Alps , near Sanetschhorn, in the Canton of Valais. It forms the Lac de Sénin (French; German: Sanetschsee) reservoir at 2034 m, and then enters the Canton of Bern , traversing the Sanetsch falls between 1900 and 1400 m. It then forms the westernmost valley of the Bernese Oberland, flowing past Gsteig, Gstaad and Saanen in the Obersimmental-Saanen district.