The Kingdom of Poland is proclaimed by the Act of 5th November of the emperors of Germany and Austria-Hungary.

The Kingdom of Poland, also known informally as the Regency Kingdom of Poland, was a short-lived polity that was proclaimed during World War I by the German Empire and Austria-Hungary on 5 November 1916 on the territories of formerly Russian-ruled Congress Poland held by the Central Powers as the Government General of Warsaw and which became active on 14 January 1917. It was subsequently transformed between 7 October 1918 and 22 November 1918 into the independent Second Polish Republic, the customary ceremonial founding date of the latter being later set at 11 November 1918.

The Act of 5th November of 1916 was a declaration of Emperors Wilhelm II of Germany and Franz Joseph of Austria. This act promised the creation of the Kingdom of Poland out of territory of Congress Poland, envisioned by its authors as a puppet state controlled by the Central Powers. The origin of that document was the dire need to draft new recruits from German-occupied Poland for the war with Russia. Even though the act itself expressed very little in concrete terms, its declaration is regarded as one of main factors in the Polish efforts to regain independence. Despite official statements, the German Empire really planned to annex up to 30,000 km² of prewar Congress Poland, with expulsion of between 2 and 3 million Poles and Jews out of these territories to make room for German settlers.

Austria-Hungary, also referred to as the Austro-Hungarian Empire, the Dual Monarchy or the Habsburg Monarchy, was a multi-national constitutional monarchy in Central Europe between 1867 and 1918. A military and diplomatic alliance, it consisted of two sovereign states with a single monarch who was titled both the Emperor of Austria and the King of Hungary. Austria-Hungary constituted the last phase in the constitutional evolution of the Habsburg monarchy: it was formed with the Austro-Hungarian Compromise of 1867 in the aftermath of the Austro-Prussian War, following wars of independence by Hungary in opposition to Habsburg rule. It was dissolved shortly after Hungary terminated the union with Austria in 1918 at the end of World War I.