Nelson Ackerman Eddy (June 29, 1901 – March 6, 1967) was an American actor and baritone singer who appeared in 19 musical films during the 1930s and 1940s, as well as in opera and on the concert stage, radio, television, and in nightclubs. A classically trained baritone, he is best remembered for the eight films in which he costarred with soprano Jeanette MacDonald. He was one of the first "crossover" stars, a superstar appealing both to shrieking bobby soxers and opera purists, and in his heyday, he was the highest paid singer in the world.

During his 40-year career, he earned three stars on the Hollywood Walk of Fame (one each for film, recording, and radio), left his footprints in the wet concrete at Grauman's Chinese Theater, earned three gold records, and was invited to sing at the third inauguration of U.S. President Franklin D. Roosevelt in 1941. He also introduced millions of young Americans to classical music and inspired many of them to pursue a musical career.