Viognier is a white wine grape. It is the only permitted grape for the French wine Condrieu in the Rhone valley. Viognier can be a difficult grape to grow because it is prone to powdery mildew. It has low and unpredictable yields and should be picked only when fully ripe.

Viognier wines are well known for their floral aromas, due to terpenes, which are also found in Muscat and Riesling wines. There are also many other powerful flower and fruit aromas which can be perceived in these wines depending on where they were grown, the weather conditions and how old the vines were.

It is a grape with low acidity; it is sometimes used to soften wines made predominantly with the red Syrah grape.