Unió Esportiva Castelldefels is a Spanish football team based in Castelldefels, in the autonomous community of Catalonia.

Founded in 1948 it currently plays in Lliga Elit, holding home matches at Municipal Els Canyars, with a capacity for 2,500 spectators.

Francisco Casacuberta, who was then the Mayor of Castelldefels, became its first president.

It eventually moved to a yellow shirt with blue shorts.

In the 2007–08, the club served as the reserve team of UE Miapuesta Castelldefels, team moved from Figueres to the city who played in Segunda División B.