Valldoreix (Catalan pronunciation: [ˌbaʎðuˈɾɛʃ]) is a community that is part of the Sant Cugat del Vallès municipality, located in the Barcelona province.
It has the status of a "decentralised municipal entity [ca]" (EMD) within the municipality.
According to a census in 2015 it has 8,096 inhabitants.
On the northern edge it connects with Mira-sol, another community in the Sant Cugat del Vallès municipality.