Chateau des ducs de Bretagne is a castle located in the city of Nantes, western France. The castle dates back to the 15th century, when it was built by the dukes of Brittany as a fortress to protect the city from invasion. It is one of the most significant landmarks in Nantes and is known for its historical and architectural importance.

The castle was originally built as a military stronghold and was later used as a residence by the dukes of Brittany. Over the years, the castle has undergone several modifications, including the addition of a Renaissance-style façade in the 16th century. Today, the castle houses the Nantes History Museum, which showcases the history of the city and the region of Brittany.

Visitors to the Chateau des ducs de Bretagne can explore the castle's towers, ramparts, and courtyards, and learn about the history of the region through the museum's collections of artifacts and exhibits. The castle's interior has been restored to its former grandeur, with period furnishings and décor that give visitors a glimpse into life in medieval and Renaissance times.