M
- Bill Mack (1961–1965)
- Rico Mack (1993–1994)
- Bill Mackrides (1953)
- Tommy Maddox (2001–2005)
- Anthony Madison (2006–2011)
- L.E. Madison (1984)
- Mike Magac (1965–1966)
- George Magulick (1944)
- Sean Mahan (2007)
- Frank Maher (1941)
- John Malecki (2011)
- Joe Malkovich (1935)
- Fran Mallick (1965)
- Mark Malone (1980–1987)
- Jim Mandich (1978)
- Ray Mansfield (1963–1976)
- Edgar Manske (1938)
- Rod Manuel (1997–1998)
- Bobby Maples (1971)
- Joseph Maras (1938–1940)
- Basilio Marchi (1934)
- Ted Marchibroda (1953–1957)
- Jerry Marion (1967)
- Henry Marker (1934)
- Jeff Markland (1988)
- Lou Marotti (1944)
- Curtis Marsh (1997)
- Marshie (1934)
- Paul Martha (1964–1969)
- Emerson Martin (1995)
- Johnny Martin (1944)
- Ricky Martin (1981)
- Tee Martin (2000–2001)
- Vernon Martin (1942)
- Grant Mason (2007–2008)
- Bob Masters (1939–1943)
- Walt Masters (1944)
- John Mastrangelo (1947–1948)
- Ed Matesic (1936)
- Joe Matesic (1954)
- Ray Mathews (1951–1959)
- Terance Mathis (2002)
- Frank Mattioli (1946)
- Marv Matuszak (1953–1956)
- Alvin Maxson (1977–1978)
- Ray May (1967–1969)
- Hayden Mayhew (1936–1938)
- Alvoid Mays (1995)
- Damon Mays (1995)
- Lee Mays (2002–2006)
- Jerry Mazzanti (1967)
- Fred McAfee (1994–1998)
- Ryan McBean (2007)
- Richie McCabe (1955–1958)
- Art McCaffray (1944–1946)
- Don McCall (1969)
- David McCann (1997)
- John McCarthy (1944)
- Jack McClairen (1953–1960)
- Willie McClung (1955–1957)
- Glenn McCombs (1986)
- Dewey McConnell (1954–1955)
- Jamie McCoy (2011)
- Antwon McCray (2002)
- Hugh McCullough (1939–1943)
- Karl McDade (1938)
- Edward McDonald (1936)
- Shaun McDonald (2009)
- Coley McDonough (1939–1941)
- Paul McDonough (1938)
- Kenny McEntyre (1995)
- Bryant McFadden (2005–2008, 2010–2011)
- Marv McFadden (1953–1956)
- Ben McGee (1964–1972)
- Rob McGovern (1991)
- Thurman McGraw (1958–1961)
- Tyrone McGriff (1980–1982)
- Sean McHugh (2008–2009)
- Kirk McJunkin (1984)
- Tim McKyer (1994)
- Leon McLaughlin (1966–1968)
- Steve McLendon (2009–2011)
- John McMakin (1972–1974)
- Johnny "Blood" McNally (1934–1939)
- Ed McNamara (1945)
- Bill McPeak (1949–1958)
- Tom McWilliams (1949–1950)
- Ed Meadows (1955)
- Bryant Meeks (1947–1948)
- Charles Mehelich (1946–1951)
- Steve Meilinger (1961)
- Rashard Mendenhall (2008–2011)
- Jamon Meredith (2011)
- Albert "Elmer" Merkovsky (1944–1946)
- Mike Merriweather (1982–1987)
- Max Messner (1964–1965)
- Dennis Meyer (1972–1973)
- Fred Meyer (1944)
- John Meyer (1982)
- Ron Meyer (1966)
- Bill Meyers (1984)
- Bill Michael (1957)
- Ed Michaels (1943)
- Lou Michaels (1961–1963)
- Art Michalik (1955–1956)
- John Michelosen (1946–1951)
- Kelvin Middleton (1987)
- Lou Midler (1939)
- Barron Miles (1995)
- Eddie Miles (1990)
- Heath Miller (2005–2011)
- Jim Miller (1994–1996)
- Josh Miller (1996–2003)
- Mike Miller (1999–2003)
- Tom Miller (1943)
- Ernie Mills (1991–1996)
- Freddie Milons (2003)
- Henry Minarik (1951)
- Tom Miner (1958–1959)
- Gene Mingo (1969–1970)
- Frank Minini (1949)
- Michael Minter (1987)
- John Mitchell (1994–2011)
- Dick Modzelewski (1955)
- Ed Modzelewski (1952–1954)
- Dicky Moegle (1960)
- Tony Momsen (1951)
- Scottie Montgomery (2010–2011)
- Bucky Moore (1933)
- Mewelde Moore (2008–2011)
- Red Moore (1947–1949)
- Tom Moore (1977–1989)
- Gonzalo Morales (1947–1948)
- Sean Morey (2004–2006)
- Bob Morgan (1967)
- Quincy Morgan (2005)
- Tom Moriarty (1980)
- Earl Morrall (1957–1958)
- Byron Morris (1994–1995)
- Jack Morris (1960)
- Steve Morse (1985)
- Rick Moser (1978–1982)
- Clure Mosher (1942)
- Norm Mosley (1948)
- Paul Moss (1933)
- Marion Motley (1955)
- Norm Mott (1934)
- Sam Mudie (1962)
- Mike Mularkey (1989–2003)
- Lee Mulleneaux (1935–1936)
- Gerry Mullins (1971–1979)
- Ryan Mundy (2008–2011)
- Dick Murley (1956)
- George Murphy (1951)
- Earl Murray (1952)
- Tom Myslinski (1996–2000)
Read more about this topic: List Of Pittsburgh Steelers Players