Donald Szantho Harrington (July 11, 1914 in Newton, Middlesex County, Massachusetts – September 16, 2005 in Romania) was an American politician and religious leader.
He was a member of the American Peace Mobilization and opposed the United States joining World War II.
They were defeated by the incumbent Republicans Nelson Rockefeller and Malcolm Wilson, but Harrington was elected a delegate to the New York State Constitutional Convention of 1967.
A past president of United World Federalists, Harrington wrote Religion in an Age of Science in 1965.
They lived in Transylvania where Harrington was active in economic development and his wife served several village congregations.