Grau Roig () is a sector of the Grandvalira ski resort in Andorra, located in the parishes of Canillo and Encamp. It includes alpine skiing and cross-country skiing tracks. It is the only sector in Grandvalira which does not have a populated settlement. The nearest major settlement is Pas de la Casa, to the east on the border with France.
A hiking trail commences here, and is the access route to the Estany de l'Illa.