| Mayo-Wells, Doug | Bicycle Advisory Committee (ABAC), 6/30/2025 | | | |
| MacDonald (R), Ralph E. | Board of Registrars, 2026 | Town Manager | | |
| Meyer, Johanna | Envision Arlington Standing Committee | Boards & Commissions | | |
| McBride, Brian | Community Preservation Act Committee, Conservation Commission | Town Manager | | |
| Muszynski, Mary | CDBG Subcommittee, CDBG Administrator | Town Manager | | |
| McNulty, Julie | Master Plan Update Advisory Committee | Town Manager | | |
| Miller, Cheryl | Master Plan Update Advisory Committee | | | |
| Mastro, Greta | Commission for Arts & Culture (ACAC), 2025 | | | |
| 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 | | |
| Melly, Ryan | Local Emergency Planning Committee, AFD Deputy Chief | Boards & Commissions, Town Manager | | |
| Marshall, Laurie | Local Emergency Planning Committee, AEMA/Aux | Boards & Commissions, Town Manager | | |
| Maxtutis, Jeffrey | TAC, Pct. Rep. 15-21, Vice Chair | Boards & Commissions, Town Manager | | |
| Morgan, Jane | Budget Revenue Task Force, School Committee | | | |
| Miano, Mark | Building Maintenance Comm | Boards & Commissions, Town Manager | | |
| Mullen, Scott | Zero Waste Arlington | Boards & Commissions, Town Manager | | |
| Melofchik, Beth | Historic Districts Commission, Broadway District, 6/2026 | Boards & Commissions, Town Manager | | |
