Marino Torlonia (29 July 1861 – 5 March 1933), 4th Prince of Civitella-Cesi, duke of Poli and Guadagnolo, was an Italian nobleman.
Torlonia's paternal grandmother was Princess Donna Anna Sforza-Cesarini, a descendant of Ludovico Sforza, Duke of Milan and patron of Leonardo da Vinci.
He was one of the richest noblemen in Italy around the beginning of the twentieth century, and introduced the first motor car in Rome.
On August 15, 1907, Torlonia married Mary Elsie Moore (1889–1941), a Connecticut heiress who was studying in Rome.
She was a daughter of the American shipping broker Charles Arthur Moore, a tool manufacturer in Greenwich, Connecticut, and of Mary L. Campbell.