| McCarthy, William | Cemetery Commission (1/2024) | | | |
| Maher, John | Building Committee (PTBC), 6/2025 | | | |
| Martini, Peter | Building Committee (PTBC), 6/2024 | | | |
| Maher, John | Cable Advisory Committee, Chair | | | |
| Mason, Michael | Budget Revenue Task Force, CFO School Department | | | |
| Mayo-Wells, Doug | Bicycle Advisory Committee (ABAC), 6/30/2025 | | | |
| McBride, Brian | Open Space Committee, Resident | | | |
| Morgan, David | Open Space Committee, Planning Department | | | |
| Morgan, David | Clean Energy Future, Conservation Agent | | | |
| Migliazzo, Sophie | Finance Committee (Prct. 4, 2024) | | | |
| Murray, Caroline | Envision Arlington Standing Committee | | | |
| McMurray, Brian | Arlington Cultural Council, Co-Chair, 6/30/2024 | Town Manager | | |
| Meeks, Amos | Clean Energy Future Committee | | | |
| Mahon, Diane M. | Budget Revenue Task Group, Select Board | Boards & Commissions, Town Manager | | |
| Mason, Michael | Audit Advisory Committee, CFO Schools | Boards & Commissions, Town Manager | | |
| Makowka, Steve | Historic Districts Commission, Chair, 2024 | Boards & Commissions, Town Manager | | |
| McCarthy, William | Public Memorial Committee | Boards & Commissions, Town Manager | | |
| Moore, Christopher | Town Meeting Procedures Committee | Boards & Commissions, Town Manager | | |
| MacDonald (R), Ralph E. | Board of Registrars, 2026 | Town Manager | | |
| Meyer, Johanna | Envision Arlington Standing Committee | Boards & Commissions | | |
