Edna St. Vincent Millay (February 22, 1892 – October 19, 1950) was an American lyrical poet and playwright. Millay was a renowned social figure and noted feminist in New York City during the Roaring Twenties and beyond. She wrote much of her prose and hackwork verse under the pseudonym Nancy Boyd.

Millay won the 1923 Pulitzer Prize for Poetry for her poem "Ballad of the Harp-Weaver"; she was the first woman and second person to win the award. In 1943, Millay was the sixth person and the second woman to be awarded the Frost Medal for her lifetime contribution to American poetry.

Her middle name derives from St. Vincent's Hospital in New York City, where her uncle's life had been saved just before her birth. Encouraged to read the classics at home, she was too rebellious to make a success of formal education, but she won poetry prizes from an early age.