The Princes' Concordat (German: Fürsten-Konkordat) was an agreement concluded in January 1447 between Pope Eugenius IV and the prince-electors of the Holy Roman Empire.
It outlined generous concessions on the part of the Pope, particularly covering the appointment of Church positions, in exchange for the support of the German princes.
Much of the negotiations for the Concordat was done through the efforts of the Emperor Frederick III's secretary Enea Silvio Piccolomini, future Pope Pius II.
The terms of the agreement were not to Eugenius IV's liking, but he felt compelled to make the concessions to the Emperor as he needed his assistance against the Council of Basle and the Catholic reform movements of that time.
Already in February 1447, in the Bull Salvatoria, he proclaimed his successors to be free to annul the terms of the agreement.