Viognier is a white wine grape. It was once a fairly common, and then rare white grape grown almost exclusively in the northern Rhône regions of France. Viognier has been planted much more extensively around the world since the early 1990s. Both California and Australia now have significant amounts of land devoted to the Viognier grape. There are also notable increases in planting in other states of the United States and in other countries.

In France, Viognier is the single permitted grape variety in the famous appellations of Condrieu and Château Grillet, which are located on the west bank of the Rhône River, about 40 km south of Lyon. The wines of Condrieu are the most famous, and most expensive, Viogniers in the world.

The best quality 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 (more than one wine enthusiast has even detected aromas of Froot Loops breakfast cereal in Viognier).