Lac des Truites is a lake in the municipality of Soultzeren (Haut-Rhin, France).

At an elevation of 1061m, its surface area is 2.8 hectares and is the highest lake of the Vosges massif.

Frenchifying the toponyms of Alsace, the lake was first called Lac du Foehrlé (ö is often spelled or changed to oe, as in Fischboedle) which then became Lac du Forlet (which it is still called on many maps and waymarks).

It seems however that French authorities misread Förle as a diminutive of the German word Forelle which in French is truite (in English trout),[2] whence the name, when in fact it is a diminutive of Föhre which means pine, meaning the name was in fact lake surrounded by small pine.

In Welche (a regional dialect) the lake is called reïf tou blan.