William Ramsey Clark (born December 18, 1927) is an American lawyer, activist and former public official. He worked for the U.S. Department of Justice, which included service as United States Attorney General from 1967 to 1969, under President Lyndon B. Johnson. He supervised the drafting and played an important role in the passage of the Voting Rights Act of 1965 and Civil Rights Act of 1968. Since leaving public office Clark has led many progressive activism campaigns, including opposition to the War on Terror, and he has offered legal defense to controversial figures such as Charles Taylor, Slobodan Milošević and Saddam Hussein.

Admitted to the bar in 1951, Ramsey Clark practiced law in Dallas. After serving in the federal government as assistant attorney general in charge of the lands division (1961-65), deputy attorney general (1965-66), and acting attorney general (Oct., 1966-Feb., 1967), he was appointed by President Johnson to succeed Nicholas Katzenbach as attorney general. Clark proved to be a vigorous defender of civil liberties and civil rights; he opposed the use of government wiretaps and initiated the first Northern school desegregation case. After leaving the government, he taught law and later became active in the anti-Vietnam War movement, visiting North Vietnam in 1972. In 1974 he was the Democratic candidate for the U.S. Senate from New York but was defeated by Jacob Javits ; he also failed in a second Senate run in 1976.