Roussillon (French pronunciation: ​[ʁusijɔ̃]; Occitan: Rossilhon) is a commune in the Vaucluse department of the Provence-Alpes-Côte d'Azur region in Southeastern France. In 2016 it had a population of 1,317. Roussillon lies within the borders of the Natural Regional Park of Luberon. In the French natural regional parks system, new economic activities may be developed only if they are sustainable.