| LeRoyer, Ann | Open Space Committee, Resident | | | |
| Lobel, Josh | Finance Committee (Prct. 8, 2025) | | | |
| LaCourt, Annie | Long Range Planning Committee | | | |
| Loosian, Kate | High School Building Committee, Community Member | | | |
| LeRoyer, Ann | Municipal Vulnerability Preparedness, Citizen | | | |
| LaCourt, Annie | Finance Committee, Vice Chair (Prct. 13, 2025) | | | |
| Larson, Susan | Arlington Cultural Council, Co-Chair, 6/30/2022 | | | |
| Logan, William | Election Modernization Committee, Board of Registrars | | | |
| Lau, Marisa | Envision Arlington Standing Committee | | | |
| Liscio, Laura | Council on Aging, 2024 | | | |
| LaCourt, Annie | Remote Participation Study Committee, Finance Committee Liaison | | | |
| Lyons, William | Arlington Committee on Tourism & Economic Development | | | |
| Luczai, Katie | Commission for Arts & Culture (ACAC), Economic Development Coordinator | | | |
| Luczai, Katie | Arlington Committee on Tourism & Economic Development | | | kluczai@town.arlington.ma.us |
| Locke, Beth | Semiquincentennial Committee, Arlington Chamber of Commerce | | | |
| LeRoyer, Ann | Master Plan Update Advisory Committee | | | |
| Lyons, William | Arlington Committee on Tourism & Economic Development | Boards & Commissions | | |
| Logan (D) , William | Board of Registrars, 2027 | Boards & Commissions | | |
| LeBlanc, Adam | Zoning Board of Appeals, Associate Member, 3/2026 | Boards & Commissions | | |
| Lionetta, Anthony | Central School Feasibility Study Committee | Boards & Commissions | | |
