| Selden Chapin | |
| Order: | 1st |
| Office: | Director General of the Foreign Service |
| Term Start: | November 13, 1946 |
| Term End: | April 30, 1947 |
| Preceded: | Position established |
| Succeeded: | Christian M. Ravndal |
| Ambassador From2: | United States |
| Country2: | Peru |
| Term Start2: | May 7, 1960 |
| Term End2: | August 7, 1960 |
| Predecessor2: | Theodore Achilles |
| Successor2: | James Loeb |
| President2: | Dwight D. Eisenhower |
| Ambassador From3: | United States |
| Country3: | Iran |
| Term Start3: | 1955 |
| Term End3: | 1958 |
| Predecessor3: | Loy W. Henderson |
| Successor3: | Edward T. Wailes |
| President3: | Dwight D. Eisenhower |
| Ambassador From4: | United States |
| Country4: | Panama |
| Term Start4: | January 2, 1954 |
| Term End4: | May 29, 1955 |
| Predecessor4: | John C. Wiley |
| Successor4: | Julian F. Harrington |
| President4: | Dwight D. Eisenhower |
| Ambassador From5: | United States |
| Country5: | the Netherlands |
| Term Start5: | October 27, 1949 |
| Term End5: | October 30, 1953 |
| Predecessor5: | Herman B. Baruch |
| Successor5: | H. Freeman Matthews |
| President5: | Harry S. Truman Dwight D. Eisenhower |
| Ambassador From6: | United States |
| Country6: | Hungary |
| Term Start6: | July 9, 1947 |
| Term End6: | February 17, 1949 |
| Predecessor6: | H. F. Arthur Schoenfeld |
| Successor6: | Nathaniel P. Davis |
| President6: | Harry S. Truman |
| Birth Date: | 19 September 1899 |
| Birth Place: | Erie, Pennsylvania, U.S. |
| Resting Place: | Arlington National Cemetery |
| Nationality: | American |
| Alma Mater: | United States Naval Academy |
| Occupation: | Diplomat |
| Spouse: | Mary Paul Noyes (m. 1927) |
| Relatives: | Hope Cooke (niece and ward) |
| Serviceyears: | 1919–1925 |
Selden Chapin (September 19, 1899 – March 26, 1963) was a career foreign service officer and United States diplomat.
Selden Chapin was born in Erie, Pennsylvania, the son of Captain Frederic Lincoln Chapin (who was commander of the battle ship Wyoming) and his wife Grace Card (Selden) Chapin. He graduated from the United States Naval Academy in 1919 and served in the U.S. Navy from 1919 to 1925. He married Mary Paul Noyes, March 30, 1927.
He was appointed a foreign service officer in March 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. Jefferson Caffery assumed the ambassadorship on 30 December 1944. Later Chapin was the U.S. ambassador to Hungary, Iran, Netherlands, Peru and Panama. Chapin and his wife are interred in Arlington National Cemetery.[1]
His son was Frederic L. Chapin, ambassador to Ethiopia and Guatemala, and his daughter was Middle East analyst Helen Chapin Metz. His niece and ward is Hope Cooke, former wife of the last king of Sikkim, Palden Thondup Namgyal.[2]