| Michael Mugnani | | Rock Cnty Sheriffs Ofc | 166 | 09/13/1991 | R |
| Vernon Mueller | | Eau Claire Police Dept | 110 | 09/23/1977 | |
| Randolph Morrissette | | Hudson Police Dept | 149 | 06/12/1987 | |
| Francis Mootz | | Necedah Police Dept | 195 | 12/11/1998 | R |
| William Moore | | Wauwatosa Police Dept | 085 | 05/27/1970 | R |
| Gary Moore | | Univ of WI | 094 | 09/13/1973 | |
| Gregory Moore | | Milwaukee Police Dept | 202 | 09/08/2000 | R |
| James Molloy | | Ashwaubenon Dept of Public Safety | 181 | 06/23/1995 | R |
| John Mizerka | | Beloit Police Dept | 095 | 12/06/1973 | R |
| H.L. Milsted | | Madison Police Dept | 044 | 06/30/1950 | D |
| Ronald Mikolic | | Sheboygan Cnty Sheriffs Ofc | 064 | 11/04/1959 | |
| Eugene Michalski | | WI Dept of Justice/DCI | 075 | 05/26/1965 | |
| Frank Meyers | | WI Dept of Justice/DCI | 095 | 12/06/1973 | D |
| Thoams Meronek | | Superior Police Dept | 099 | 12/05/1974 | |
| Cecil Meredith | | Sparta Police Dept | 169 | 06/12/1992 | R |
| Benjamin Mendez | | Wisconsin State Patrol | 170 | 09/04/1992 | |
| Orval Meister | | Whitefish Bay Police Dept | 044 | 06/30/1950 | D |
| Theodore Meekma | | Wisconsin State Patrol | 103 | 12/11/1975 | |
| Mark Meddaugh | | Watertown Police Dept | 196 | 03/26/1999 | R |
| Patrick McNally | | Eau Claire Police Dept | 174 | 09/24/1993 | Deceased 2/9/2020 |
| Dennis McIntosh | | Sturgeon Bay Police Dept | 140 | 03/22/1985 | R |
| Jack McGregor | | Clam Lake Police Dept | 136 | 03/23/1984 | R |
| Charles McGee | | Watertown Police Dept | 153 | 06/17/1988 | R |
| Patrick McCardle | | South Milwaukee Police Dept | 164 | 03/22/0191 | R |
| Thomas Mcallister | | Bayfield Cnty Sheriffs Ofc | 102 | 09/25/1975 | |
