Samuel Winfield Lewis (October 1, 1930 – March 10, 2014) was an American diplomat. During a lengthy career with the United States Department of State, he served as Assistant Secretary of State for International Organization Affairs (1975–1977), U.S. ambassador to Israel (1977–1985) and Director of Policy Planning (1993–1994). As ambassador to Israel, Lewis played a major part in brokering the Camp David Accords between Israel and Egypt. He also headed the United States Institute of Peace from 1987 through 1993.