Guy R. Gregg (born December 14, 1949, Brooklyn, New York) is an American Republican Party politician, who served in the New Jersey General Assembly from 1992 to 2008, where he represented the 24th Legislative District. He was a candidate for the Republican nomination for United States Senator in 2002. Gregg served in the Assembly as Republican Conference Leader from 2004 to 2006, was the Majority Whip from 1998 to 1999 and the Assistant Majority Whip from 1996 to 1998. He served in the Assembly on the Human Services Committee and the Labor Committee.