Castellví de Rosanes is a municipality in the comarca of the Baix Llobregat, in the province of Barcelona, Catalonia, Spain. It covers an area of 16.4 km2 and had 1,807 inhabitants as of 2016.
The municipality includes the neighbourhoods of Els Àngels, Can Sunyer del Palau, Miralles, El Taió and Valldaina. It is located between Martorell and Gelida, both larger cities connected by Renfe rail services.