Helen Francesca Traubel (June 16, 1899 – July 28, 1972) was an American opera and concert singer. A dramatic soprano, she was best known for her Wagnerian roles, especially those of Brünnhilde and Isolde. Born and raised in St. Louis, Missouri, she began her career as a concert singer and went on to sing at the Metropolitan Opera from 1937-53. Starting in the 1950s, she also developed a career as a nightclub and cabaret singer as well as appearing in television, films and musical theatre. Traubel spent her later years in Santa Monica, California, where she died at the age of 73.