Ennio Bolognini (November 7, 1893—July 31, 1979) was an Argentine-born American cellist, guitarist, composer, conductor, professional boxer, pilot, and flight instructor. Though seldom remembered today, his musical virtuosity was widely admired by his contemporaries during his lifetime. Pablo Casals praised him as "the greatest cello talent I ever heard in my life". Gregor Piatigorsky told Christine Walevska's father, "No, I am not the greatest cellist in the world; neither is Feuermann. The greatest is the Argentine Bolognini."