Roger Hilsman Jr. (November 23, 1919 – February 23, 2014) was an American soldier, government official, political scientist, and author. He served in Merrill's Marauders and then with the Office of Strategic Services as a guerrilla leader in the China-Burma-India Theater of World War II. He later became an aide and adviser to President John F. Kennedy, and briefly to President Lyndon B. Johnson, in the U.S. State Department while he served as Director of the Bureau of Intelligence and Research in 1961 to 1963 and Assistant Secretary of State for Far Eastern Affairs in 1963 to 1964.