Endicott Howard Peabody (February 15, 1920 – December 2, 1997) was an American politician from Massachusetts. A Democrat, he served a single two-year term as the 62nd Governor of Massachusetts, from 1963 to 1965. His tenure is probably best known for his categorical opposition to the death penalty and for signing into law the bill establishing the University of Massachusetts Boston. After losing the 1964 Democratic gubernatorial primary, Peabody made several more failed bids for office in Massachusetts and New Hampshire, including failed campaigns for the U.S. Senate in 1966 and 1986.

Born in Lawrence, Massachusetts to a family with deep colonial roots, Peabody played college football at Harvard University, where he earned honors as an All-American lineman. He served in the United States Navy in World War II before embarking on a political career noted more for its failures than its successes. He made multiple unsuccessful attempts to win the position of Massachusetts Attorney General, and for the United States Senate representing both Massachusetts and New Hampshire, and ran for United States Vice President in 1972.