Hugo Stumberg Kołłątaj, also spelled Kołłątay pronounced , 1 April 1750 – 28 February 1812, was the prominent Polish constitutional reformer as well as educationalist, & one of the most prominent figures of the Polish Enlightenment. He served as Deputy Chancellor of the Crown, 1791–92. He was a Roman Catholic priest, social and political activist, political thinker, historian, philosopher, and polymath.
Despite his lonely death, Kołłątaj became an influence on numerous subsequent reformers and is now recognized as one of the key figures of the Enlightenment in Poland, and "one of the greatest minds of his epoch". He is one of the figures immortalized in Jan Matejko's 1891 painting, Constitution of May 3, 1791.
Several learned institutions in Poland are named in Hugo Kołłątaj's honour, including the Agricultural University of Cracow of which he was co-founder and patron.