Rocca di Riva, Medieval castle in Riva del Garda, Italy.

Rocca di Riva is a medieval fortress with thick stone walls, four corner towers, and a bridge crossing a canal. The building now functions as a museum and houses archaeological collections spanning different historical periods.

The castle is first documented in 1393 as Castrum novum, though its origins trace to 1124, when Bishop Altmann of Trento allowed Riva's inhabitants to build a fortress. The Scaligeri expanded it in the 14th century with four towers and a moat. After Venetian rule and a 1440 siege, it became a residence of the Prince-Bishops of Trento. In the 19th century it was converted into an Austrian barracks, giving it its present appearance.

The fortress has housed Riva's civic museum since the 1950s, now the MAG Museo Alto Garda. Its name recalls the bishops of Trento: Bishop Bernhard von Cles made the Rocca his residence in Riva and rebuilt its west and south wings, and during the Council of Trent receptions were held inside. The Madruzzo bishops, Cristoforo and his nephew Giovanni Ludovico, also stayed here and extended it as a residence.

Access to the fortress and museum requires purchasing tickets at the on-site ticket office. The gardens around the building are partially open outside museum hours, allowing a free view from outside.

The collection includes prehistoric objects from ancient stilt settlements around the lake, many thousands of years old. These finds show that people have inhabited the shores of Lake Garda since earliest times.