Viosinho is a white grape variety grown principally in the Douro Valley of Portugal. Traditionally, Viosinho has been an unpopular variety with growers because of its very low yields. It is only recently that winemakers have realised what a treasure it is, as a component both in port and in unfortified Douro white blends. It makes full-bodied but fresh, fragrant, well-balanced wines, performing best in hot, sunny climates where it is less prone to oidium and botrytis infection. Bunches and grapes are small and early-ripening.