| LeRoyer, Ann | Open Space Committee, Resident | | | |
| Lobel, Josh | Finance Committee (Prct. 8, 2025) | | | |
| LaCourt, Annie | Long Range Planning Committee | | | |
| Lucarelli, Stephanie | Information Technology Advisory Committee | Boards & Commissions, Town Manager | | |
| LeRoyer, Ann | Master Plan Advisory Committee | Boards & Commissions, Town Manager | | |
| Leger, Colleen | Local Emergency Planning Committee, Director Health & Human Services | Boards & Commissions, Town Manager | | |
| Lyons, William | Arlington Committee on Tourism & Economic Development | | | |
| Laube, Melissa | TAC, Pct. Rep. 8-14 | Boards & Commissions, Town Manager | | |
| Laube, Melissa | Parking Advisory Committee, Transportation Advisory Committee | Boards & Commissions, Town Manager | | |
| Lionetta, Anthony | Central School Feasibility Study Committee | Boards & Commissions | | |
| LeRoyer, Ann | Master Plan Implementation Committee | Boards & Commissions | | |
| Lau, Kin | Redevelopment Board, Vice Chair (1/31/2027) | Boards & Commissions | | KLau@town.arlington.ma.us |
| Lasker, Phil | Park & Recreation Commission, 2022 | Boards & Commissions, Town Manager | | |
| 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 | | | |
