Harlan Cleveland (January 19, 1918 – May 30, 2008) was an American diplomat, educator, and author. He served as Lyndon Johnson's U.S. Ambassador to NATO, 1965–1969, and earlier as U.S. Assistant Secretary of State for International Organization Affairs, 1961–1965. He was President of the University of Hawaii 1969–1974, and the World Academy of Art and Science in the 1990s and founding dean of the University of Minnesota's Hubert H. Humphrey Institute of Public Affairs. Cleveland also served as Dean of the Maxwell School of Citizenship and Public Affairs from 1956 to 1961.
He was born in New York City to Stanley Cleveland and Marian Van Buren. His siblings were Harold van Buren Cleveland, an economist, Anne Cleveland White, an artist, and Stanley Cleveland, a diplomat. He attended Phillips Andover Academy and graduated from Princeton University in 1938. He was a Rhodes Scholar at Oxford University in the late 1930s. He was an early advocate and practitioner of online education, teaching courses for the Western Behavioral Sciences Institute (WBSI) and Connected Education in the 1980s and early 1990s.