| 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 | |
| David Mayer | | Eau Claire Cnty Sheriffs Ofc | 101 | 06/19/1975 | D |
| Frederick Mathews | | Green Bay Police Dept | 083 | 05/28/1969 | |
| Elwood Mason | | Marathon Cnty Sheriffs Ofc | 102 | 09/25/1975 | |
| Roy Martinson | | Superior Police Dept | 090 | 09/15/1972 | |
| Hugh Martin | | Oconomowoc Police Dept | 154 | 09/09/1988 | R |
| Thomas Martin | | Brown Cnty Sheriff's Ofc | 174 | 09/24/1993 | R |
| Daniel Marcou | | La Crosse Police Dept | 175 | 12/17/1993 | R |
| Bruce Marco | | LaCrosse Police Dept | 114 | 09/22/1978 | |
