Susan Margaret Collins (born December 7 1952) is the junior U.S. Senator from Maine and a Republican.

Collins worked for Senator William Cohen from 1975 until 1987, when she became chairman of the Maine commission on financial regulation. She served in this position until 1992, when she briefly served as New England regional director of the National Small Business Administration. She then moved to Massachusetts and served as its Deputy Treasurer in 1993, but then moved back to Maine. She was the Republican candidate in the Maine gubernatorial election of 1994, but both she and the Democrat, former Governor Joe Brennan were defeated by the Independent candidate, Angus King. When Senator Cohen announced his retirement, Collins announced her Senate candidacy, and after a difficult three-way primary she defeated Democrat Joe Brennan in the general election. She was reelected in 2002 over State Senator Chellie Pingree (D) 58% - 42%.