Francesco Pacelli (1 February 1872 – 22 April 1935), Noble of Acquapendente and Noble of Sant'Angelo in Vado, was an Italian lawyer and the elder brother of Eugenio Pacelli, who would later become Pope Pius XII. He became a lay canon lawyer and the legal advisor to Pope Pius XI, acted as a legal advisor to Pope Pius XI; in this capacity, he assisted Cardinal Secretary of State Pietro Gasparri in the negotiation of the Lateran Treaty in 1929 with Benito Mussolini, which established the independence of Vatican City, bringing an end to the Roman Question.