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
- Sam McMahon (born 1967), Australian Senator for the Northern Territory since 2019
See also
- Chad McMahan (fl. 1990s–2010s), Mississippi State Senate
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