Mary Ellen Moylan (August 24, 1925 – April 28, 2020) was an American ballet dancer. She was one of the first students of George Balanchine's School of American Ballet, and made her New York stage debut in 1942. She had danced with Ballet Russe de Monte Carlo, Ballet Society, Ballet Theatre (now American Ballet Theatre), Metropolitan Opera Ballet, and on Broadway. She was best known for performing Balanchine's works, and was described as "the first great Balanchine dancer". She retired from performing in 1957.