| Lyons, William | Arlington Committee on Tourism & Economic Development | | | |
| Lyons, William | Arlington Committee on Tourism & Economic Development | Boards & Commissions | | |
| Luczai, Katie | Parking Advisory Committee, Planning | Town Manager | | |
| Luczai, Katie | Commission for Arts & Culture (ACAC), Economic Development Coordinator | | | |
| Luczai, Katie | Arlington Committee on Tourism & Economic Development | | | kluczai@town.arlington.ma.us |
| Lucarelli, Stephanie | Information Technology Advisory Committee | Boards & Commissions, Town Manager | | |
| Loosian, Kate | High School Building Committee, Community Member | | | |
| Logan (D) , William | Board of Registrars, 2027 | Boards & Commissions | | |
| Logan, William | Election Modernization Committee, Board of Registrars | | | |
| Locke, Beth | Semiquincentennial Committee, Arlington Chamber of Commerce | | | |
| Lobel, Josh | Finance Committee (Prct. 8, 2025) | | | |
| Liscio, Laura | Council on Aging, 2024 | | | |
| Lionetta, Anthony | Central School Feasibility Study Committee | Boards & Commissions | | |
| LeRoyer, Ann | Master Plan Implementation Committee | Boards & Commissions | | |
| LeRoyer, Ann | Master Plan Advisory Committee | Boards & Commissions, Town Manager | | |
| LeRoyer, Ann | Open Space Committee, Resident | | | |
| LeRoyer, Ann | Municipal Vulnerability Preparedness, Citizen | | | |
| LeRoyer, Ann | Master Plan Update Advisory Committee | | | |
| Leger, Colleen | Local Emergency Planning Committee, Director Health & Human Services | Boards & Commissions, Town Manager | | |
| LeBlanc, Adam | Zoning Board of Appeals, Associate Member, 3/2026 | Boards & Commissions | | |
