Senator McMahon may refer to:
Brien McMahon (1903–1952), U.S. Senator from Connecticut from 1945 to 1952 Larry McMahon (1929–2006), Senate of Ireland Martin T. McMahon (1838–1906), New York State Senate P. J. McMahon (politician) (1888–1939), Nebraska Legislature Sam McMahon (born 1967), Senate of Australia
See also Chad McMahan (fl. 1990s–2010s), Mississippi State Senate