Sanssouci(French "carefree") is the former summer palace of Frederick the Great, King of Prussia at Potsdam, just outside Berlin. It is often counted among the German rivals of Versailles. While Sanssouci is in the more intimate Rococo style and is far smaller than its French Baroque counterpart, it is notable for the numerous temples and follies in Sanssouci Park. Designed by Georg Wenzeslaus von Knobelsdorff between 1745 and 1747 to fulfil Frederick's need for a private residence where he could relax away from the pomp and ceremony of the Berlin court, the palace is little more than a large single-storey villa—more like the Château de Marly than Versailles. Containing just ten principal rooms, it was built on the brow of a terraced hill at the centre of the park. So great was the influence of Frederick's personal taste in the design and decoration of the palace that its style is characterised as "Frederician Rococo", and so personally did he regard the palace that he conceived it as "a place that would die with him". Because of a disagreement about the sight of the palace from the park Knobelsdorff was fired in 1746. Jan Bouman, a Dutch architect finished the project.

During the 19th century, the palace became a residence of Frederick William IV. He employed the architect Ludwig Persius to restore and enlarge the palace, while Ferdinand von Arnim was charged with improving the locality and thus the view from the palace. The town of Potsdam, with its palaces, was a favourite place of residence for the German imperial family until the fall of the Hohenzollern dynasty in 1918.

After World War II, the palace became a tourist attraction in East Germany. It was fully maintained with due respect to its historical importance, and was open to the public. Following German reunification in 1990, the final wish of Frederick came to pass: his body was finally returned to his beloved palace and buried in a new tomb overlooking the gardens he had created. Sanssouci and its extensive gardens became a World Heritage Site in 1990 under the protection of UNESCO; in 1995, the Foundation for Prussian Palaces and Gardens in Berlin-Brandenburg was established to care for Sanssouci and the other former imperial palaces in and around of Berlin. These palaces are now visited by more than two million people a year from all over the world.