Robert Merrill (June 4, 1917 – October 23, 2004) was an American operatic baritone.

Merrill was born Moishe Miller, later known as Morris Miller, in the Williamsburg section of Brooklyn, New York, to tailor Abraham Miller, originally Milstein, and his wife Lillian, née Balaban, immigrants from Warsaw, Poland.

His mother claimed to have had an operatic and concert career in Poland (a fact denied by her son in his biographies) and encouraged her son to have early voice training: he had a tendency to stutter, which disappeared when singing. Merrill was inspired to pursue professional singing lessons when he saw the baritone Richard Bonelli singing Count Di Luna in a performance of Il Trovatore at the Metropolitan Opera, and paid for them with money earned as a semi-professional pitcher