William Butts Macomber Jr. (March 28, 1921 – November 19, 2003) was an official in the United States Department of State and a United States diplomat who later became the first full-time president of The Metropolitan Museum of Art.
Macomber was born in Rochester, New York, on March 28, 1921. He attended Phillips Andover, graduating in 1940, and Yale University, graduating in 1943. During World War II, he served in the United States Marine Corps, assigned to the Office of Strategic Services. After the war, he returned to Yale, receiving a master's degree in 1947. He next attended Harvard Law School, receiving his law degree in 1949. He then worked at Boston University as a lecturer in government, then moved on to the University of Chicago, receiving a second master's degree in 1951.
Macomber joined the Central Intelligence Agency in 1951. Two years later, he moved to the United States Department of State as a special assistant of intelligence.
In 1957, President of the United States Dwight D. Eisenhower nominated Macomber as Assistant Secretary of State for Legislative Affairs and Macomber held this office from October 21, 1957, until February 27, 1961.