Marcello Cesare Augusto Petacci (Italian pronunciation: [marˈtʃɛllo ˈtʃeːzare auˈɡusto peˈtattʃi]; Rome, 1 May 1910 – Dongo, Lombardy, 28 April 1945) was an Italian surgeon and businessman, the brother of actress Maria Petacci and of dictator Benito Mussolini's lover Clara Petacci.