The Château de Thorens is a castle in the commune of Thorens-Glières in the Haute-Savoie département of France. It is accessible from the north-east of Annecy by a road of about 20 km, going up to the plateau of Glières. It is often confused with the Château de Sales that was formerly its neighbour of a few hundred metres; Sales was destroyed on the order of king Louis XIII in 1630. Since the liberation of France at the end of World War II, the castle has sometimes incorrectly been called Château de Thorens-Glières, based on the current name of the commune, but it has always rightly been just de Thorens.
At the exit of the village of Thorens-Glières, on the road of the famous plateau of Glières, the castle appears in proud silhouette in a beautiful mountainous setting. It is built on an ancient fort dating to 1060, built by the order of count Gérold de Genève, who bestowed it upon his faithful comrade in arms, Lord Odon de Compey.
The castle was confiscated by the duke of Savoie in 1479. Many crimes, abuses and executions were reported to have been committed by the lords of Compey, so the castle was offered of Hélène de Luxembourg, spouse of prince Janus de Savoie, duke of Genève. Hélène was, however, not interested in Thorens; her daughter Louise de Savoie, who married her cousin François de Luxembourg, inherited the Château de Thorens.
Later, in 1559, Thorens was sold to Sébastien II de Luxembourg and Lord François de Sales de Boisy, father of Saint François de Sales. The Lord de Sales already owned the Château de Sales, located a few hundred metres from the Château de Thorens. Pledged also to the lords of Compey, initially, the Château de Sales thus came to the keeping of the princes of Luxembourg. The Lord de Sales occupied the prestigious charge of maître d'hôtel of the residence of prince Sébastien II. In the 17th century, the family of Sales, originating from La Roche-sur-Foron and extremely old, saw a fast rise, occupying the highest charges at the House of Savoy in Turin, going from the titles of baron to those of count and, finally, marquis.