| LaBau, Brian | Architect, At Large, 2025 | Boards & Commissions, Town Manager | | |
| LaCourt, Annie | Finance Committee, Vice Chair (Prct. 13, 2025) | | | |
| LaCourt, Annie | Long Range Planning Committee | | | |
| LaCourt, Annie | Remote Participation Study Committee, Finance Committee Liaison | | | |
| Larson, Susan | Arlington Cultural Council, Co-Chair, 6/30/2022 | | | |
| Lasker, Phil | Park & Recreation Commission, 2022 | Boards & Commissions, Town Manager | | |
| Lau, Kin | Redevelopment Board, Vice Chair (1/31/2027) | Boards & Commissions | | KLau@town.arlington.ma.us |
| Lau, Marisa | Envision Arlington Standing Committee | | | |
| Lau, Marisa | Senior Planner | Planning | (781) 316-3091 | mlau@town.arlington.ma.us |
| Laube, Melissa | Parking Advisory Committee, Transportation Advisory Committee | Boards & Commissions, Town Manager | | |
| Laube, Melissa | TAC, Pct. Rep. 8-14 | Boards & Commissions, Town Manager | | |
| LeBlanc, Adam | Zoning Board of Appeals, Associate Member, 3/2026 | Boards & Commissions | | |
| Leger, Colleen | Local Emergency Planning Committee, Director Health & Human Services | Boards & Commissions, Town Manager | | |
| LeRoyer, Ann | Master Plan Advisory Committee | Boards & Commissions, Town Manager | | |
| LeRoyer, Ann | Master Plan Implementation Committee | Boards & Commissions | | |
| LeRoyer, Ann | Master Plan Update Advisory Committee | | | |
| LeRoyer, Ann | Municipal Vulnerability Preparedness, Citizen | | | |
| LeRoyer, Ann | Open Space Committee, Resident | | | |
| Lionetta, Anthony | Central School Feasibility Study Committee | Boards & Commissions | | |
| Liscio, Laura | Council on Aging, 2024 | | | |
