Nicolò Pacassi (5 March 1716 – 11 November 1790), also known as Nikolaus Pacassi, was an Italian-Austrian architect. He was born in Wiener Neustadt in Lower Austria in a family of merchants from Gorizia. In 1753, he was appointed court architect to Maria Theresa of Austria. He was commissioned many works throughout the Austrian Empire, mainly in Vienna, Prague, Innsbruck, Buda and his native Gorizia and Gradisca. He died in Vienna.