| Mongold, Neal | Affordable Housing Trust Fund Board | Town Manager | | |
| McMurray, Brian | Arlington Cultural Council, Co-Chair, 6/30/2024 | Town Manager | | |
| Mann, Dana | Audit Advisory Committee, Acting Director of Assessors | Town Manager | | |
| Mason, Michael | Audit Advisory Committee, CFO Schools | Boards & Commissions, Town Manager | | |
| Magee, Alex | Audit Advisory Committee, Deputy Town Manager | Town Manager | | |
| Mayo-Wells, Doug | Bicycle Advisory Committee (ABAC), 6/30/2025 | | | |
| McNeill, Adam | Bicycle Advisory Committee (ABAC), 6/30/2025 | | | |
| MacDonald (R), Ralph E. | Board of Registrars, 2026 | Town Manager | | |
| Mason, Michael | Budget Revenue Task Force, CFO School Department | | | |
| Morgan, Jane | Budget Revenue Task Force, School Committee | | | |
| Mahon, Diane M. | Budget Revenue Task Group, Select Board | Boards & Commissions, Town Manager | | |
| Martini, Peter | Building Committee (PTBC), 6/2024 | | | |
| Maher, John | Building Committee (PTBC), 6/2025 | | | |
| Miano, Mark | Building Maintenance Comm | Boards & Commissions, Town Manager | | |
| Maher, John | Cable Advisory Committee, Chair | | | |
| Magee, Alex | Capital Planning Committee, Deputy Town Manager/Finance Director | | | |
| Muszynski, Mary | CDBG Subcommittee, CDBG Administrator | Town Manager | | |
| Mahon, Diane | CDBG Subcommittee, Select Board | | | |
| McCarthy, William | Cemetery Commission (1/2024) | | | |
| Michele, Hassler | Cemetery Commission, (6/2025) | | | |
