Greer Grimsley (born May 30, 1956) is an American bass-baritone who has had an active international opera career for the last three decades. He has sung leading roles with all of America's leading opera companies, including the Metropolitan Opera, the Lyric Opera of Chicago, the Seattle Opera, the San Francisco Opera, the Gran Teatre del Liceu of Barcelona, and the Houston Grand Opera. He has also performed on the stages of many important European opera houses.