Val-de-Sos (; ) is a commune in the Ariège department in southern France. The municipality was established on 1 January 2019 by merger of the former communes of Vicdessos (the seat), Sem, Goulier and Suc-et-Sentenac.
The commune is structured by the Vicdessos valley, irrigated by the eponymous river, in the historic territory of Sabarthès. The main access road is the D8 from Tarascon-sur-Ariège.
It is part of the Ariège Pyrenees Regional Nature Park.