Muscat bleu is a red Swiss wine and table grape variety that is a hybrid of Garnier 15-6 and Perle noire.

[1] Muscat bleu is considered to be a "complex hybrid", meaning that within its lineage are grape varieties belonging to several different species of the grapevine genus, Vitis.

Muscat bleu has good resistance to fungal infections such as downy mildew but is susceptible to the viticultural hazards of coulure and millerandage.

[1] Today Muscat bleu is found in Switzerland and Belgium where it is used for both table grape and wine production.

In Switzerland, the grape is a popular planting among home gardeners but as of 2009 at least 3 hectares (7.4 acres) of Muscat bleu was dedicated to commercial wine production.