The Warsaw Confederation, also called the Compact of Warsaw, was a political-legal act concluded in Warsaw by the first Convocation Sejm of the Polish–Lithuanian Commonwealth and formally promulgated in Kraków on 28 January 1573. Convened and deliberating as a confederation between 6 and 29 January 1573, during the Commonwealth's first interregnum (1572–1574), the Sejm sought to establish a general confederation to secure continuity of governance and prepare for the election of a new king. The confederation also aimed to enact a guarantee of religious tolerance, ensuring the political equality of dissenters with Catholics. It is regarded as one of the first European acts to grant freedom of religion.