Hôtel de Blossac, Classical private mansion in historic center, Rennes, France.

The Hôtel de Blossac is an 18th-century hôtel particulier on rue du Chapitre, built in 1728, with two adjoining main wings and a grand staircase in the courtyard side. Its garden side has a perron and a carved facade; the courtyard side is plainer. The building reuses part of the older Hôtel de Brie (1624) to the west.

Louis Gabriel de La Bourdonnaye, comte de Blossac and president of the Parlement de Bretagne, had the mansion built in 1728 on ground cleared by the Rennes fire of 1720, reusing part of the older Hôtel de Brie; Jean-François Huguet supervised the work. The city leased it for nearly two centuries as the residence of the commander-in-chief of Brittany. It was divided into apartments in the 19th century, classified as a historic monument in 1947, and has belonged wholly to the State since 1982.

The name comes from the La Bourdonnaye family, counts of Blossac, who owned the mansion while the city leased it for the commander in chief of Brittany. Its layout was meant to recall the pomp of the French court. Since 1982 the state has housed the regional cultural affairs directorate here, and the garden looks onto the south side of the Saint-Sauveur basilica.

Access is limited since a regional cultural administration occupies the building on rue du Chapitre. The public can usually see the interior only during European Heritage Days.

The French novelist Paul Féval was born within these walls in 1816, during a time when the building had already been converted into apartments. The birthplace of a notable author adds a literary connection to the address.