Sally Ann Lilienthal (March 19, 1919 – October 24, 2006), née Lowengart, was an American nuclear disarmament activist who founded the Ploughshares Fund in 1981 during the Cold War in the belief that the threat of nuclear war overshadowed everything else. The Ploughshares Fund continues to provide grants to individuals and organizations advocating against nuclear weapons. Lilienthal also served as national vice chairwoman of Amnesty International in 1977. Lilienthal was also an artist and art advocate who served on the board of the San Francisco Museum of Modern Art for most of the 1970s.