Vinhão, also known as Sousão in the Douro region, is a Portuguese red grape variety primarily valued for its deep color, producing wines with an intensely dark, almost opaque red hue. Originally from the Minho region in northern Portugal, it later took root in the Douro, where it is mainly used to add color and freshness to blends, particularly in Port wine.

In the Vinhos Verdes region, Vinhão is the most widely planted red variety. Its clusters are medium-sized, with equally medium-sized berries that have thick, bluish-black skins. It ripens mid- to late-season and prefers warm climates to reach full maturity.

Wines made from Vinhão are characterized by their high acidity, which can sometimes result in very sharp, tangy wines. They are highly structured, with a deep, almost opaque color due to the high concentration of anthocyanins in the skins. However, unlike many other teinturier grape varieties, only the skin is deeply pigmented, while the pulp remains colorless. On the palate, these wines typically offer aromas of cherry and wild berries, often accompanied by a firm, rustic edge. The best examples come from the Basto and Amarante sub-regions within the Vinho Verde DOC.

In the Douro, Sousão is primarily used in blends to enhance the color and freshness of wines, including Port wines. While single-varietal wines do exist, especially in the Minho region, their appeal remains relatively limited outside their region of origin. ​