Warren Grant "Maggie" Magnuson (April 12, 1905 – May 20, 1989) was an American lawyer and politician. A member of the Democratic Party, he served as a U.S. Representative (1937–1944) and a U.S. Senator (1944–1981) from Washington. He served over 36 years in the Senate, and was the most senior member of the body during his final two years in office.