| Maack, Mick | 2013 | 18U | Assistant Coach |
| MacCagnan, Jack | 2021 | 15U | Operations Coordinator |
| MacFarland, Jerry | 1989 | 18U | Certified Athletic Trainer |
| 1991 | 18U | Certified Athletic Trainer |
| Machtolf, Mark | 2006 | Collegiate | Assistant Coach |
| Maddux, Greg | 2013 | Professional (WBC) | Pitching Coach |
| Madsen, Bryan | 2023 | 12U | Assistant Coach |
| 2024 | 12U | Manager |
| 2025 | 12U | Manager |
| Maestri, Ron | 1981 | Collegiate | Manager |
| Mainieri, Paul | 2015 | Collegiate | Assistant Coach |
| 2018 | Collegiate | Manager |
| Manuel, Jerry | 2023 | Professional (WBC) | Assistant Coach |
| Marek, Matt | 2009 | 14U | Press Officer |
| Marfione, Ron | 2004 | Women's | Assistant Coach |
| Marich, Martin | 1977 | Collegiate | Assistant Coach |
| Marquess, Mark | 1980 | Collegiate | Assistant Coach |
| 1988 | Collegiate (Olympics) | Manager |
| Marrow, Troy | 2017 | 18U | Operations Coordinator |
| Martinez, Buck | 2006 | Professional (WBC) | Manager |
| Martinez, Tino | 2017 | Professional (WBC) | Hitting Coach |
| Mattalino, Angelo | 2006 | Professional | Team Physician |
| 2007 | Professional | Team Physician |
| 2009 | Professional | Team Physician |
| 2011 | Professional, Professional | Team Physician |
| 2015 | Professional | Team Physician |
| Maxwell, Jason | 2016 | 15U | Assistant Coach |
| 2018 | 15U | Manager |
| 2021 | 18U | Manager |
| 2023 | 18U | Assistant Coach |
| May, Ernie | 2018 | Women's | Assistant Coach |
| May Jr., Lee | 2005 | Professional | Hitting Coach |
| Maynard, Sonny | 1980 | Collegiate | Assistant Coach |
| Mayo, Tim | 2016 | Women's | Assistant Coach |
| Mazmanian, Art | 1984 | Collegiate (Olympics) | Assistant Coach |
| McArtor, Gene | 1986 | Collegiate | Assistant Coach |
| McCann, Brian | 2023 | Professional (WBC) | Assistant Coach |
| McConnell, Jodi | 2017 | 15U | Certified Athletic Trainer |
| McCormack, John | 2024 | Collegiate | Hitting Coach |
| McDonald, Dave | 1999 | 18U | Assistant Coach |
| McDonnell, Dan | 2009 | Collegiate | Assistant Coach |
| 2019 | Collegiate | Manager |
| McEssy, Dan | 2014 | 12U | Operations Coordinator |
| McIvor, Neal | 2023 | Collegiate | Certified Athletic Trainer |
| McKeever, Stan | 2007 | 16U | Assistant Coach |
| McKenzie, Lunch | 2023 | 12U | Assistant Coach |
| McKenzie, Mark | 1997 | 16U | Assistant Coach |
| 1998 | 16U | Manager |
| 2008 | 18U | Assistant Coach |
| McLaren, John | 2006 | Professional (WBC) | Assistant Coach |
| McLeod, Mike | 2003 | 18U | Assistant Coach |
| McMahon, Pat | 1991 | Collegiate | Assistant Coach |
| 1997 | Collegiate | Assistant Coach |
| 2001 | Collegiate | Manager |
| McRae, Brian | 2010 | 18U | Assistant Coach |
| Meade, Skylar | 2024 | Collegiate | Pitching Coach |
| Medina, Nic | 2013 | 12U | Certified Athletic Trainer |
| 2014 | 12U | Certified Athletic Trainer |
| 2015 | 12U | Certified Athletic Trainer |
| Medina, Nick | 2009 | 18U | Certified Athletic Trainer |
| Medlock, Ken | 1999 | Professional | Assistant Coach |
| Meinhold, Ricky | 2017 | 18U | Assistant Coach |
| Melanson, Al | 2004 | Women's | Assistant Coach |
| Melendez, Mervyl | 2018 | 18U | Assistant Coach |
| Mendoza, Reynol | 2019 | Women's | Pitching Coach |
| 2022 | Women's | Pitching Coach |
| 2023 | Women's | Pitching Coach |
| 2024 | Women's | Pitching Coach |
| Meredith, Kier | 2024 | Collegiate | Assistant Coach |
| Meusborn, Tom | 2011 | 16U | Assistant Coach |
| 2012 | 15U | Manager |
| 2013 | 15U | Manager |
| Meyer, Scott | 2002 | 18U | Press Officer |
| Meyers, Jerry | 2008 | Collegiate | Assistant Coach |
| Milano, Bob | 1985 | Collegiate | Assistant Coach |
| 1988 | Collegiate (Olympics) | Assistant Coach |
| 1997 | Collegiate | Manager |
| Miller, Butch | 1989 | 18U | Manager |
| Mills, Brad | 2001 | Professional | Assistant Coach |
| Modami, Ali | 2023 | Professional (WBC) | BP Pitcher |
| Mohler, Mark | 2013 | 15U | Certified Athletic Trainer |
| Moir, Seth | 2017 | Collegiate | Assistant Coach |
| Moncel, Kim | 2014 | Women's | Certified Athletic Trainer |
| 2015 | Women's, Women's | Certified Athletic Trainer |
| 2016 | Women's | Certified Athletic Trainer |
| 2018 | Women's | Certified Athletic Trainer |
| 2019 | Women's | Certified Athletic Trainer |
| 2021 | 12U | Certified Athletic Trainer |
| 2022 | 12U | Certified Athletic Trainer |
| Moore, Brett | 2019 | Collegiate | Press Officer |
| Moore, Greg | 2015 | 18U | Assistant Coach |
| 2016 | 18U | Assistant Coach |
| 2019 | Collegiate | Pitching Coach |
| Moore, Jackie | 1999 | Professional | Assistant Coach |
| Moravick, Adam | 2009 | 16U | Assistant Coach |
| 2010 | 16U | Assistant Coach |
| Morgan, Mike | 2014 | Women's | Assistant Coach |
| 2015 | Women's | Manager |
| 2015 | Women's | Assistant Coach |
| Morris, Jim | 1987 | Collegiate | Assistant Coach |
| 1990 | Collegiate | Manager |
| Morton, Patrick | 2019 | 18U | Operations Coordinator |
| Moseley, Adam | 2018 | 15U | Pitching Coach |
| 2022 | 18U | Pitching Coach |
| Mosiello, Bill | 2017 | 18U | Assistant Coach |
| 2025 | Collegiate | Assistant Coach |
| Moss, Barry | 2000 | Professional | Assistant Coach |
| 2002 | Professional | Hitting Coach |
| 2005 | Professional | Assistant Coach |
| Motter, James | 2023 | Women's | Creative Services |
| 2024 | Women's, 15U | Creative Services |
| 2025 | 15U | Creative Services |
| Mulvihill, Bob | 1975 | Collegiate | Delegation Head/Business Manager |
| 1977 | Collegiate | Delegation Head/Business Manager |
| Muñoz, Carlos | 2024 | Collegiate | Bullpen Coach |
| 2024 | Professional | Bullpen Catcher |
| Munoz, Carlos | 2023 | Professional (WBC) | Bullpen Catcher |
| 2024 | Collegiate | Bullpen Coach |
| 2024 | Professional | Bullpen Catcher |
| 2025 | Collegiate | Bullpen Coach |
| Munson, Eric | 2013 | 18U | Assistant Coach |
| Murakani, Les | 1978 | Collegiate | Assistant Coach |
| Murphy, Dale | 2013 | Professional (WBC) | Assistant Coach |
| Murray,Colin | 2019 | 12U | Certified Athletic Trainer |
| Myers, Ernie | 1973 | Collegiate | Coach |
