La Valsainte Charterhouse or La Valsainte (Latin: Vallis sanctorum omnium, later Vallis Sancta) situated in La Valsainte in the district of Gruyère, Canton of Fribourg , is the only remaining extant Carthusian monastery in Switzerland .

The charterhouse, in the heart of the valleys of the Javro and the Jaun, was founded in 1295 by Girard I, lord of Corbières. In the Middle Ages it was the owner of a vast territory covering the greater part of the present communes of Cerniat and Charmey , over which by right of its lordship it exercised the high and the low justice. It was destroyed by fire in 1381.

In 1454 it passed into the lordship of the County of Greyerz, with which it passed again in 1535 to the city of Fribourg. The government of Fribourg were not kindly disposed toward the monastery, but their efforts to suppress it and absorb its revenues were for many years opposed by the French, who supported it.