Castillo de Tossa de Mar, or Tossa de Mar Castle, is a historic fortress situated in the coastal town of Tossa de Mar, in the province of Girona, Catalonia, Spain. The castle is located on a hill overlooking the town, and is an iconic symbol of the town's medieval history.

The castle dates back to the 12th century and was built by the Moors as part of their coastal defense system. It was later used by the Catholic Monarchs as a strategic fortification during the Reconquista. Over the centuries, the castle has been modified and renovated multiple times, with the most significant restoration taking place in the early 20th century.

Today, the castle is a popular tourist attraction and is open to the public for guided tours. Visitors can explore the castle's towers, walls, and battlements, which offer stunning views of the Mediterranean Sea and the surrounding coastline. The castle's interior also houses a small museum with exhibits on the history and architecture of the fortress.