Selden Chapin (September 19, 1899 – March 26, 1963) was a career foreign service officer and United States diplomat.

He graduated from the United States Naval Academy in 1919 and served in the U.S. Navy from 1919 to 1925.

After the liberation of Paris in August 1944, he served as Charge d'Affaires in the American Embassy in the absence of an ambassador, since France formally broke off diplomatic relations with the U.S. after the Torch Invasion of North Africa in November 1942.

Later Chapin was the U.S. ambassador to Hungary, Iran, Netherlands, Peru and Panama.

His niece and ward is Hope Cooke, former wife of the last king of Sikkim, Palden Thondup Namgyal.