or
Player positions provided by the CFL and errors are known to exist
Other teams associated with the Ottawa Rough Riders:
| Name | Position | Regular GP | # of Seasons (Years) | Also played for |
|---|---|---|---|---|
| MacCready, Derek | DL | 34 | 2 (1994–1995) | BC, EDM, HAM |
| Macdonald, Harold | E | 1 | 1 (1938) | REG |
| MacDonnell, Benny | FW, G, HB, T | 70 | 6 (1949–1954) | SSK |
| Macias, Jay | QB | 18 | 1 (1995) | |
| Mack, Tracey | LB | 4 | 1 (1987) | SSK, WPG |
| MacMillan, Ivan | K | 14 | 1 (1970) | BC, SSK, TOR |
| Macoritti, Ray | K | 3 | 1 (1993) | EDM |
| Madsen, Lynn | DE | 5 | 1 (1988) | SSK |
| Magnuson, Quinn | OL | 4 | 1 (1995) | MTL, SSK, WPG |
| Mahon, Pat | C, G | 10 | 3 (1993–1995) | CGY, HAM |
| Mandarich, John | DT | 13 | 1 (1990) | EDM |
| Mankins, Jim | FB | 24 | 3 (1968–1970) | EDM |
| Manley, Dexter | DE | 5 | 2 (1992–1993) | |
| Manners, Jack | G, T | 4 | 2 (1935–1936) | WPG, WRCAFB |
| Manns, Eric | LB | 5 | 1 (1981) | |
| Marbury, Kerry | RB | 4 | 1 (1974) | TOR |
| Marcelin, Al | DB | 79 | 6 (1970–1975) | |
| Marcil, Brian | LB | 2 | 1 (1975) | CGY, MTL |
| Marko, Steve | QB | 2 | 1 (1945) | |
| Marler, David | QB | 3 | 1 (1984) | HAM |
| Marley, Rohan | LB | 7 | 1 (1995) | |
| Marof, Frank | SB | 5 | 1 (1994) | CGY, HAM |
| Marrin, Blane | G | 6 | 1 (1932) | |
| Marriott, Sean | LB | 10 | 1 (1995) | BC |
| Marshall, Greg | DL | 120 | 8 (1980–1987) | |
| Marshall, Herb | DB | 3 | 1 (1973) | |
| Martin, Andrew | SB | 5 | 2 (1994–1995) | HAM, WPG |
| Martin, Blane | G, T | 0 | 1 (1931) | |
| Martin, Manny | DB | 20 | 2 (1994–1995) | BC |
| Martin, Maurice | DB | 17 | 2 (1984–1985) | |
| Martino, Tony | K, P | 2 | 1 (1988) | BC, CGY, TOR |
| Maruska, Mike | HB | 7 | 1 (1955) | SSK |
| Masters, Wally | HB | 5 | 1 (1932) | |
| Mathers, Frank | HB | 13 | 2 (1945–1946) | WRCAFB |
| Matheson, Ian | G | 4 | 1 (1932) | |
| Maunders, Bob | C | 4 | 1 (1931) | |
| Mayotte, Vic | E | 4 | 2 (1931–1932) | |
| Mazzanti, Geno Jr. | FW, HB | 4 | 1 (1952) | |
| Mazzoli, Nick | WR | 18 | 1 (1994) | BC, EDM, HAM |
| McBride, Billy | DB | 7 | 1 (1984) | BC, SSK |
| McBride, Pat | C | 10 | 1 (1980) | |
| McCallum, Paul | K, P | 3 | 1 (1993) | BC, SSK |
| McCambridge, John | DE | 2 | 1 (1969) | |
| McCarthy, Tony | E, HB | 74 | 10 (1934–1940, 1945–1947) | |
| McCarthy, Bob | HB | 21 | 2 (1965–1966) | CGY, EDM, MTL |
| McCauley, Harry | E, FW, HB | 25 | 5 (1934–1938) | |
| McCollum, Jim “Bubba” | DT | 1 | 1 (1975) | |
| McCray, Tim | RB | 16 | 2 (1984–1985) | SSK |
| McCullagh, Gord | QB | 2 | 2 (1940, 1945) | |
| McCurdy, Brian | DB | 7 | 1 (1994) | HAM, TOR |
| McDermott, Lloyd | T | 11 | 1 (1952) | |
| McDonald, Flip | E | 9 | 1 (1949) | |
| McDonald, Harold | E | 3 | 1 (1937) | |
| McDonald, Ray | WR | 6 | 1 (1989) | SSK |
| McFall, Elwood | E | 11 | 3 (1937–1939) | |
| McFaul, Jim | E | 6 | 1 (1948) | SSK |
| McGarry, Paul | G | 6 | 1 (1940) | MTL |
| McGee, Doug | G | 45 | 4 (1977–1980) | |
| McGee, Sylvester “Molly” | RB | 13 | 2 (1975–1976) | SSK |
| McGowan, Paul | LB | 20 | 2 (1989–1990) | |
| McGriggs, Lamar | LB | 10 | 1 (1996) | HAM, SSK, WPG |
| McHugh, Tom | HB | 7 | 1 (1954) | |
| McIntyre, Mike | DB | 32 | 3 (1985–1987) | HAM |
| McJunkins, Prince | QB | 14 | 2 (1983–1984) | |
| McKay, Bob | E | 1 | 1 (1955) | CGY, HAMWC, TOR |
| McKee, Steve | LB | 2 | 1 (1995) | HAM |
| McKelton, Willie | DB | 1 | 1 (1973) | |
| McKeown, Bob | C | 70 | 5 (1971–1975) | |
| McKinnis, Hugh Jr. | RB | 4 | 1 (1972) | BC, CGY |
| McLarty, Ted | G, HB, T | 45 | 5 (1948–1952) | |
| McLeod, Andy | LB | 3 | 1 (1975) | SSK |
| McNutt, Bernard | FW, HB | 6 | 1 (1934) | |
| McPhail, George | HB | 5 | 1 (1948) | MTL, SSK, WPG |
| McPherson, Donald | QB | 18 | 1 (1994) | HAM |
| McWatters, Arnie | HB, K, QB | 12 | 2 (1939–1940) | |
| Meacham, Lamont | DB | 23 | 2 (1985–1986) | TOR |
| Means, Kelvin | WR | 1 | 1 (1996) | HAM |
| Meeks, Ron | DB | 3 | 1 (1979) | HAM, TOR |
| Meiers, Buddy | C | 15 | 2 (1934–1935) | |
| Mero, Joe | DB | 25 | 2 (1993, 1996) | BC, SHR, TOR |
| Merritt, Charles | LB | 6 | 1 (1989) | |
| Merz, Curt | E | 5 | 1 (1960) | WPG |
| Michaels, Eddie “Whitey” | G | 35 | 3 (1948–1950) | |
| Miles, Ellard “Ed” | G, T | 32 | 4 (1948–1951) | MTL |
| Miles, Warner | G | 3 | 1 (1984) | BC, HAM, TOR |
| Miller, Greg | LB | 15 | 1 (1986) | EDM, HAM |
| Miller, Joe | T | 11 | 1 (1976) | SSK |
| Miller, Ken | DB | 31 | 2 (1983–1984) | CGY, MTL |
| Miller, Pat | LB | 13 | 2 (1989–1990) | |
| Millham, Bernie | E | 12 | 1 (1946) | |
| Mills, Jim | T | 15 | 1 (1994) | BC |
| Mills, Troy | RB | 5 | 1 (1996) | EDM, SA, SAC, WPG |
| Minter, Cedric | RB | 13 | 1 (1987) | TOR |
| Mitchell, Edward | LB | 6 | 1 (1995) | |
| Mitchell, Mark | DB | 8 | 2 (1977–1978) | |
| Mitchell, Mike | DB | 2 | 1 (1990) | |
| Mitchell, William | LB | 16 | 2 (1981–1982) | EDM, MTL, TOR |
| Mofford, Ian | HB | 14 | 1 (1979) | MTL, WPG |
| Mohr, Larry | RB | 34 | 2 (1987–1988) | EDM |
| Molinski, Stan | HB | 3 | 1 (1947) | |
| Moll, Nayland | HB | 9 | 1 (1957) | TOR |
| Monds, Wonderful Jr. | DB | 30 | 3 (1976–1977, 1979) | |
| Monroe, Forbes | G | 1 | 1 (1947) | |
| Monroe, James | C | 54 | 3 (1994–1996) | SSK |
| Moomaw, Donn | C, E | 2 | 1 (1955) | TOR |
| Moore, Cal | HB | 3 | 1 (1938) | TOR |
| Moore, Kenny | DE, U | 19 | 2 (1976–1977) | |
| Moore, Rodney | DB | 1 | 1 (1986) | |
| Moore, Shawn | QB | 6 | 1 (1995) | CGY, WPG |
| Moors, Mark | G | 6 | 1 (1988) | CGY, HAM, WPG |
| Moreau, Jacques | G | 10 | 2 (1993, 1995) | MTL |
| Morgan, Bobby | DB | 1 | 1 (1969) | TOR |
| Morneau, Jack | K, T | 19 | 2 (1950–1951) | |
| Morrical, Benny | G | 1 | 1 (1950) | |
| Morris, Alex | SB | 2 | 1 (1977) | CGY, TOR, WPG |
| Morris, Horace | LB | 12 | 1 (1995) | |
| Morrison, Arnie “Red” | HB, QB | 37 | 6 (1933–1938) | MTL |
| Mosca, Angelo | T | 28 | 2 (1960–1961) | HAM, MTL |
| Moses, Paul | TE | 1 | 1 (1976) | |
| Moss, Joe | T | 12 | 1 (1955) | |
| Moton, Barry | DE | 2 | 1 (1989) | |
| Moynahan, Cyrill “Curly” | C | 55 | 8 (1935–1940, 1945–1946) | |
| Mularchyk, Ed | HB | 7 | 2 (1955–1956) | |
| Mumphrey, Lloyd | DE | 3 | 1 (1989) | EDM |
| Murphy, Dan | DB | 14 | 1 (1995) | EDM, TOR |
| Murphy, Mike | FB | 59 | 4 (1977–1980) | |
| Murray, Andrew | SB | 14 | 1 (1994) | BC, TOR |
| Murray, Stan | U | 4 | 1 (1946) | |
| Myrick, Bobby | DB | 0 | 1 (1976) | |
| “M” player count: 129 | ||||