Bombus mucidus is a species of bumblebee. It is native to southern Europe. The species' local common names include Grauweiße Hummel. This is a species of high-altitude mountain habitat. It occurs in the mountain ranges of southern Europe, including the Cordillera Cantábrica, the Pyrenees, the Alps, the Apennines, the Balkans, the Carpathians, and the Crna Gora Mountains. It occurs in prefers the warmer southern slopes, where it lives in subalpine grassland habitat. It feeds on many kinds of plants.