Castillo de Santa Florentina is a medieval castle located in the town of Canet de Mar, which is part of the province of Barcelona, Spain. The castle was built in the late 11th century on the ruins of a Roman villa and has since been remodeled multiple times.

The castle was used as the location for the castle of the Lannisters in the popular television series "Game of Thrones" during the sixth season.

Today, the castle is privately owned and not open to the public, but visitors can still admire the exterior of the castle, which has been well-preserved over the centuries. The castle's towers, crenellated walls, and pointed arches are typical of Gothic architecture. The castle also has a chapel and a courtyard with a well. From the castle, visitors can enjoy stunning views of the surrounding area, including the nearby Mediterranean Sea.