Leahy married Marcelle Pomerleau in 1962. They live in a farmhouse in Middlesex, Vermont that they moved to from Burlington, and have three children. Leahy celebrated his fifty year anniversary with his wife, saying ‘‘We hate it when we’re apart from one another.’’ Leahy is legally blind in one eye. Leahy was targeted in an anthrax attack November 16, 2001.