The Treaty of Pressburg was signed on December 26, 1805 between France and Austria as a consequence of the Austrian defeats by France at Ulm (September 25 - October 20) and Austerlitz (December 2). A truce was agreed on December 4 and negotiations for the treaty began. The treaty was signed at the Primate's Palace in Pressburg (since 1919 called Bratislava) by Napoleon and the Holy Roman Emperor Francis II. It is also known as the Fourth Peace of Pressburg.

Beyond the clauses establishing "peace and amity" and the Austrian withdrawal from the Third Coalition the treaty also took substantial European territories from Austria. The gains of the previous treaties of Campo Formio and Lunéville were reiterated and Austrian holdings in Italy and Bavaria were ceded to France. Certain Austrian holdings in Germany were passed to the French allies - the King of Bavaria, the King of Württemberg and the Elector of Baden. Austrian claims on those German states were renounced without exception. The treaty marked the effective end of the Holy Roman Empire, Francis II became instead Emperor Francis I of Austria and a new entity the Confederation of the Rhine was later created by Napoleon. An indemnity of 40 million francs to France was also included in the treaty.