Robert Mitchell
- 1966 – Pennsylvania’s 23rd congressional district (D) – lost
Steve Mitchell
- 1982 – Florida’s 14th congressional district (R) – lost
Timothy A. Mitchell
- 1974 – New York’s 20th congressional district (CON) – lost
W. Mitchell
- 1984 – Colorado’s 3rd congressional district (D) – lost
Wendell Mitchell
- 1978 – Alabama’s 2nd congressional district (D) – lost
William D. Mitchell
- 1980 – California’s 25th congressional district (L) – lost
Chris Mitchum
- 2014 – California’s 24th congressional district (R) – lost
John M. Mitnick
- 1996 – Georgia’s 4th congressional district (R) – lost
Tracy Mitrano
- 2018 – New York’s 23rd congressional district (D, WF, WE) – lost
- 2020 – New York’s 23rd congressional district (D, WF) – lost
George Mitris
- 2020 – New York’s 25th congressional district (R, CON) – lost
Leo Mittelmeier
- 1932 – Pennsylvania’s 29th congressional district (Comm.) – lost
- 1934 – Pennsylvania’s 29th congressional district (Comm.) – lost
Billy J. Mixon
- 1968 – Georgia’s 3rd congressional district (R) – lost
Luke Mixon
- 2022 – United States Senate (Louisiana) (D) – lost
Chester Louis Mize
- 1964 – Kansas’ 2nd congressional district (R) – won
- 1966 – Kansas’ 2nd congressional district (R) – won
- 1968 – Kansas’ 2nd congressional district (R) – won
- 1970 – Kansas’ 2nd congressional district (R) – lost
Wilmer David Mizell
- 1968 – North Carolina’s 5th congressional district (R) – won
- 1970 – North Carolina’s 5th congressional district (R) – won
- 1972 – North Carolina’s 5th congressional district (R) – won
- 1974 – North Carolina’s 5th congressional district (R) – lost
- 1976 – North Carolina’s 5th congressional district (R) – lost
George Alfred Mizer, Jr.
- 1974 – Oklahoma’s 1st congressional district (R) – lost
Heather R. Mizeur
- 2022 – Maryland’s 1st congressional district (D) – lost
John Joseph Moakley
- 1972 – Massachusetts’ 9th congressional district (Ind. Con.) – won
- 1974 – Massachusetts’ 9th congressional district (D) – won
- 1976 – Massachusetts’ 9th congressional district (D) – won
- 1978 – Massachusetts’ 9th congressional district (D) – won
- 1980 – Massachusetts’ 9th congressional district (D) – won
- 1982 – Massachusetts’ 9th congressional district (D) – won
- 1984 – Massachusetts’ 9th congressional district (D) – won
- 1986 – Massachusetts’ 9th congressional district (D) – won
- 1988 – Massachusetts’ 9th congressional district (D) – won
- 1990 – Massachusetts’ 9th congressional district (D) – won
- 1992 – Massachusetts’ 9th congressional district (D) – won
- 1994 – Massachusetts’ 9th congressional district (D) – won
- 1996 – Massachusetts’ 9th congressional district (D) – won
- 1998 – Massachusetts’ 9th congressional district (D) – won
- 2000 – Massachusetts’ 9th congressional district (D) – won
W. O. Moats
- 1922 – Kentucky’s 3rd congressional district (R) – lost
Charles Mobley
- 1994 – Illinois’ 7th congressional district (R) – lost
Gordon E. Mobley
- 1984 – Oklahoma’s 4th congressional district (L) – lost
Gordon Mobley
- 1998 – Texas’ 17th congressional district (L) – lost
Russell G. Mobley
- 1968 – Kentucky’s 6th congressional district (R) – lost
Mary Veronica Kasser Mochary
- 1984 – United States Senate (New Jersey) (R) – lost
Fred M. Mock
- 1954 – United States Senate (Oklahoma) (R) – lost
Ira J. Mock
- 1932 – Arkansas’ 2nd congressional district (R) – lost
Tristin Mock
- 2008 – Oregon’s 2nd congressional district (PG) – lost
Louis J. Modica
- 1980 – New York’s 2nd congressional district (R, CON, RTL) – lost
Maury Modine
- 1992 – United States Senate (Utah) (L) – lost
I. J. Moe
- 1936 – North Dakota’s at large congressional district (I) – lost
Joseph P. Moe
- 1946 – Florida’s 6th congressional district (R) – lost
James C. Moeller
- 2016 – Washington’s 3rd congressional district (D) – lost
Walter Henry Moeller
- 1958 – Ohio’s 10th congressional district (D) – won
- 1960 – Ohio’s 10th congressional district (D) – won
- 1962 – Ohio’s 10th congressional district (D) – lost
- 1964 – Ohio’s 10th congressional district (D) – won
- 1966 – Ohio’s 10th congressional district (D) – lost
A. L. Moen
- 1930 – Iowa’s 10th congressional district (I) – lost
Ross Moen
- 2002 – California’s 35th congressional district (R) – lost
- 2004 – California’s 35th congressional district (R) – lost
George R. Moffatt
- 1922 – Connecticut’s 4th congressional district (S) – lost
- 1924 – Connecticut’s 4th congressional district (S) – lost
- 1926 – Connecticut’s 4th congressional district (S) – lost
- 1928 – Connecticut’s 4th congressional district (S) – lost
- 1930 – Connecticut’s 4th congressional district (S) – lost
- 1940 – Connecticut’s 4th congressional district (S) – lost
Stanley Moffatt
- 1948 – California’s 18th congressional district (Ind. Prog.) – lost
Anthony John Moffett, Jr.
- 1974 – Connecticut’s 6th congressional district (D) – won
- 1976 – Connecticut’s 6th congressional district (D) – won
- 1978 – Connecticut’s 6th congressional district (D) – won
- 1980 – Connecticut’s 6th congressional district (D) – won
- 1982 – United States Senate (Connecticut) (D) – lost
- 1990 – Connecticut’s 5th congressional district (D) – lost
Mike Moffett
- 2018 – Kentucky’s 4th congressional district (I) – lost
George Lee Moffett
- 1922 – Indiana’s 9th congressional district (D) – lost
Terrill K. Moffett
- 1978 – Mississippi’s 1st congressional district (R) – lost
- 1980 – Mississippi’s 1st congressional district (R) – lost
Thom Moffitt
- 2002 – Michigan’s 5th congressional district (W/I) – lost
Karen Mofitt
- 1992 – Florida’s 10th congressional district (D) – lost
Ali Mohamed
- 2004 – New York’s 16th congressional district (R, CON) – lost
- 2006 – New York’s 16th congressional district (R, CON) – lost
- 2008 – New York’s 16th congressional district (R, CON) – lost
Richard A. Mohan
- 1954 – Illinois’ 15th congressional district (D) – lost
Ethel M. Mohler
- 2002 – California’s 43rd congressional district (L) – lost
Paul (Stormy) Mohn
- 1996 – United States Senate (Oregon) (L) – lost
Stormy Mohn
- 1982 – Colorado’s 3rd congressional district (L) – lost
Linda Mohrbacher
- 1980 – United States Senate (Pennsylvania) (SW) – lost
Hermoine P. Mokray
- 1960 – New York’s 27th congressional district (Liberal) – lost