El Vallès (or simply Vallès) is a historical county in Catalonia, Spain, located in the center of the Catalan Pre-coastal range. It is nowadays represented by two separate administrative divisions which are part of the Barcelona Province, named comarques. One of them is the Western Vallès, which has two capitals, Sabadell and Terrassa, whereas the second comarca is the Eastern Vallès, with Granollers as its capital.
The present division of Vallès has its historical roots in the legal districts of Granollers and Terrassa, established in 1834. However, the first time this subdivision was explicitly used as sanctioned by law was in 1936, with the official division of Catalonia in comarques. Some parts of this region belong to the metropolitan area of Barcelona and the Àmbit Metropolità de Barcelona, and is nowadays connected with Barcelona with public transportations systems such as FGC's so-called Metro del Vallès.