Stanisław Wawrzyniec Staszic (baptised 6 November 1755 – 20 January 1826) was a leading figure in the Polish Enlightenment: a Catholic priest, philosopher, geologist, writer, poet, translator and statesman. A physiocrat, monist, pan-Slavist (after 1815) and laissez-fairist, he supported many reforms in Poland. He is particularly remembered for his political writings during the "Great (Four-Year) Sejm" (1788–92) and for his large support towards the Constitution of 3 May 1791, adopted by that Sejm.