Betty Allen (17 March 1927 ? 22 June 2009) was a renowned American operatic mezzo-soprano who had an active international singing career during the 1950s through the 1970s. In the latter part of her career her voice acquired a contralto-like darkening, which can be heard on her recording of Sergei Prokofiev’s Alexander Nevsky with conductor Eugene Ormandy and the Philadelphia Orchestra.