Mary Margaret Haugen (born January 14, 1941) is an American politician. She was a Washington state senator from 1993 to 2013 and served chairwoman of the Senate Transportation Committee. From 1982 to 1992, Haugen served in the Washington House of Representatives. Before that, she served three terms as a member of the Stanwood School Board. Haugen is married and lives on Camano Island. She is a Democrat.