| Walter Ostrenga | Email hidden; Javascript is required. | Madison Police Dept | 206 | 09/07/2001 | R |
| Doug Osell | Email hidden; Javascript is required. | Superior Police Dept | 168 | 03/20/0192 | R |
| Roger Olson | Email hidden; Javascript is required. | Menomonee Falls Police Dept | 131 | 12/17/1982 | R |
| Brian O'Keefe | Email hidden; Javascript is required. | WI - Dept of Justice | 222 | 09/16/2005 | R |
| John Niebuhr | Email hidden; Javascript is required. | Vilas Cnty Sheriffs Ofc | 152 | 03/25/1988 | R |
| Dean Nickel | Email hidden; Javascript is required. | WI Dept of Justice/DCI | 170 | 09/04/1992 | R |
| Rich Neureuther | Email hidden; Javascript is required. | FBI | | | R |
| Michael Neuens | Email hidden; Javascript is required. | New Berlin Police Dept | 147 | 12/12/1986 | R |
| Gerald Mullen | Email hidden; Javascript is required. | FBI | 268 | 06/09/2017 | R |
| Douglas Muldoon | Email hidden; Javascript is required. | Palm Bay Police Dept - Palm Bay, FL/ecoATM | 153 | 06/17/1988 | R |
| Mathew Mueller | Email hidden; Javascript is required. | Fond du Lac Police Dept | 226 | 09/15/2006 | R |
| Gust Moulas | Email hidden; Javascript is required. | Elm Grove Police Dept | 153 | 06/17/1988 | R |
| Craig Moser | Email hidden; Javascript is required. | Muskego Police Dept | 231 | 12/14/2007 | R |
| Morris Moriwaki | Email hidden; Javascript is required. | FBI | | | R |
| Michael Morehouse | Email hidden; Javascript is required. | Berlin Police Dept | 125 | 06/12/1981 | R |
| Alfonso Morales | Email hidden; Javascript is required. | Fitchburg Police Dept | 245 | 06/10/2011 | R |
| David Mitchell | Email hidden; Javascript is required. | FBI | | | R |
| Dean Meyer | Email hidden; Javascript is required. | Rusk Cnty Sheriffs Ofc | 175 | 12/17/1993 | R |
| Kenneth Meuler | Email hidden; Javascript is required. | West Bend Police Dept | 169 | 06/12/1992 | R |
| Robert Mendyk | Email hidden; Javascript is required. | Eagle River Police Dept | 116 | 03/23/1979 | R |
| Michael Meehan | Email hidden; Javascript is required. | New Berlin Police Dept | 171 | 12/11/1992 | R |
| Steven McQuaid | Email hidden; Javascript is required. | Lafayette Cnty Sheriffs Ofc | 192 | 03/27/1998 | R |
| Patrick Mckeough | Email hidden; Javascript is required. | Fond du Lac Police Dept | 234 | 09/12/2008 | R |
| Frank McElderry | Email hidden; Javascript is required. | Waukesha Cnty Sheriffs Dept | 238 | 09/18/2009 | R |
| James McDermott | Email hidden; Javascript is required. | FBI | | | R |
