William Orville Douglas (October 16, 1898 - January 19, 1980) was a Supreme Court justice.
Appointed by Franklin D. Roosevelt, he was sworn into office on April 17, 1939. He retired on November 12, 1975. By the time of his retirement, he had written more Supreme Court opinions than any one else, before or since. At 36 years, Douglas served on the Supreme Court bench longer than anyone else.