William Dooley (September 9, 1932 – July 2, 2019 in Modesto, California) is an American operatic bass-baritone who has sung with many of the world's greatest opera companies. He began his career in Germany in the late 1950s, ultimately becoming a leading performer at the Deutsche Oper Berlin from 1962 to 1964. He then embarked on a highly successful career at the Metropolitan Opera where he sang regularly between 1964 and 1977. Between 1977 and 1982 he sang regularly at the Vienna State Opera, after which he remained active as a freelance artist on the international stage through the early 1990s.