The Philippsburg palace (German: Schloss Philippsburg)) was a former Baroque-style palace in Ehrenbreitstein, a district of the city of Koblenz in Germany. It was situated on the banks of the Rhine river, below the Ehrenbreitstein Fortress. Constructed between 1626 and 1632 by Philipp Christoph von Sötern (1567–1652), Prince-Elector of Trier, it served as the main residence of the Archbishops and Prince-Electors of Trier until 1786. The palace had similarities to Schloss Johannisburg in Aschaffenburg, as they have the same architect.
In 1786, Prince-Elector Clemens Wenceslaus of Saxony (1739–1812) erected a new electoral palace in Koblenz on the opposite bank of the Rhine, which then became the primary residence.
During the Napoleonic era, the French army blew up the Ehrenbreitstein fortress in 1801, causing the Philippsburg palace to suffer significant damage and necessitating its demolition. Today, nothing remains of the palace, once one of the largest and most significant Baroque buildings on the Rhine. Only the adjacent structures (the Pagerie, Dicasterial building, Krummstall, and Marstall) have withstood the test of time.