Judd Alan Gregg (born February 14, 1947) is a former Governor of New Hampshire and current United States Senator serving as ranking member of the Senate Budget Committee. He is a member of the Republican Party and was a businessman and attorney in Nashua before entering politics. Gregg was nominated for Secretary of Commerce in the Cabinet by President Barack Obama, but withdrew his name on February 12, 2009.

Born in Nashua, he is the son of Hugh Gregg, who was Governor from 1953 to 1955. Gregg graduated from Phillips Exeter Academy in 1965. Gregg received his baccalaureate from Columbia University in 1969 and, from Boston University School of Law, a Juris Doctor in 1972 and a Master of Laws in 1975.

The second elective office held by Gregg was a seat on the Executive Council of New Hampshire, a post which he held from 1978 to 1980. He was elected to the United States House of Representatives in 1980, and was reelected in 1982, 1984 and 1986. He declined to run for reelection in 1988, and ran for Governor of New Hampshire instead. He won that election and was reelected in 1990, New Hampshire being one of two states (Vermont is the other) that continues to elect its governors to two-year, rather than four-year, terms. He served in that position until 1993.