| MacDonald (R), Ralph E. | Board of Registrars, 2026 | Town Manager | | |
| Magee, Alex | Capital Planning Committee, Deputy Town Manager/Finance Director | | | |
| Magee, Alex | Audit Advisory Committee, Deputy Town Manager | Town Manager | | |
| Maher, John | Building Committee (PTBC), 6/2025 | | | |
| Maher, John | Cable Advisory Committee, Chair | | | |
| Mahon, Diane | CDBG Subcommittee, Select Board | | | |
| Mahon, Diane | Long Range Planning Committee | Boards & Commissions | | |
| Mahon, Diane M. | Select Board, Vice Chair, 2026 | | (781) 646-9038 | DMahon@town.arlington.ma.us |
| Mahon, Diane M. | Budget Revenue Task Group, Select Board | Boards & Commissions, Town Manager | | |
| Mahon, Diane M. | School Enrollment Task Force, Select Board | Town Manager | | DMahon@town.arlington.ma.us |
| Makowka, Steve | Historic Districts Commission, Chair, 2024 | Boards & Commissions, Town Manager | | |
| Mann, Dana | Audit Advisory Committee, Acting Director of Assessors | Town Manager | | |
| Marshall, Laurie | Local Emergency Planning Committee, AEMA/Aux | Boards & Commissions, Town Manager | | |
| Martin, Anna | Prevention Services Manager | Health & Human Services | (781) 316-3193 | amartin@town.arlington.ma.us |
| Martini, Peter | Building Committee (PTBC), 6/2024 | | | |
| Mason, Michael | Budget Revenue Task Force, CFO School Department | | | |
| Mason, Michael | Audit Advisory Committee, CFO Schools | Boards & Commissions, Town Manager | | |
| Mason, Michael | High School Building Committee, School Chief Financial Officer | | | |
| Mastro, Greta | Commission for Arts & Culture (ACAC), 2025 | | | |
| Maxtutis, Jeff | Mass Ave/Appleton Design Review Committee, Transportation Advisory Committee | | | |
