Alfred Hamilton Barr, Jr. (January 28, 1902 – August 15, 1981), known as Alfred H. Barr, Jr., was an art historian and the first director of the Museum of Modern Art in New York City.
American art historian and administrator who played an enormously important and controversial role in establishing an intellectual and institutional framework for the study and appreciation of modern art. He was born in Detroit, the son of a Presbyterian minister, and studied art and archaeology at Princeton University, graduating in 1922 and taking an MA degree the following year. After several months travelling in Europe, he returned to the USA and taught art history in several leading institutions including Wellesley College, where he taught the first course at an American college devoted solely to 20th-century art. In 1929 he was appointed director of the newly founded Museum of Modern Art.