Sant Cugat del Vallès (Catalan pronunciation: [ˌsaŋ kuˈɣad dəl βəˈʎɛs]) is a town and municipality north of Barcelona, Catalonia.

Known as Castrum Octavianum in antiquity (which literally means the castle of Octavianus) and as Pins del Vallès during the Second Spanish Republic, it is named after Saint Cucuphas, who is said to have been martyred on the spot now occupied by its medieval monastery.

In addition to the monastery, the town's other notable buildings include the School of Architecture of the Vallès and the Centre d'Alt Rendiment (CAR, translit.

Sant Cugat has become an affluent suburb of Barcelona due to its location (only 20 kilometres from the city), its natural surroundings, and its pedestrian shopping area.

Sant Cugat has seen its population increase in recent years, with more births than bigger cities like Barcelona (2004).