Kuressaare Castle is a medieval fortress located in the town of Kuressaare on the island of Saaremaa, Estonia. The castle was constructed in the 14th century by the Livonian Order, and it served as the main stronghold of their power in the area. The castle has seen many different owners and occupants throughout its history, including the Danish, Swedish, and Russian empires.

The castle was originally built in a Gothic style, but it has been extensively renovated and expanded over the centuries. Today, it is a well-preserved example of a medieval fortress, with a mix of architectural styles and elements from different eras. The castle features multiple towers, walls, and courtyards, as well as a moat and drawbridge.

Today, the castle is home to the Saaremaa Museum, which features exhibits on the island's history and culture. Visitors can explore the castle's many rooms and corridors, including the castle chapel, the governor's quarters, and the tower rooms. The castle also hosts events and concerts throughout the year, making it a popular destination for tourists and locals alike.