| Anderson, Kristen | AHNAP, Business Owner | | | |
| Aries, Olivier | Tree Committee, 01/31/2026 | | | |
| Aronow, MaryEllen | Tree Committee, 12/2025 | Boards & Commissions, Town Manager | | |
| Aslanian, John | TAC, Member At Large | Planning | | |
| Auster, Adam | Town Meeting Procedures Committee, Asst. Moderator | Boards & Commissions, Town Manager | | |
| Axelrod Lehrich, Joan | Board of Youth Services | Boards & Commissions, Town Manager | | |
| Badik, Adam | Election Modernization Committee, Democratic Town Committee | | | |
| Bagnall, Alex | Envision Arlington Standing Committee | Planning | | |
| Bagnall, Alexander | Remote Participation Study Committee | | | |
| Baillieul, Pat | Council on Aging, 2022 | Boards & Commissions, Town Manager | | |
| Baker, Olga | Arlington Committee on Tourism & Economic Development | Boards & Commissions | | |
| Baldwin, David | Historic Districts Commission, Commissioner At-Large, 2025 | Boards & Commissions, Town Manager | | |
| Ballin, Jim | Zero Waste Arlington | | | |
| Ballin, Jim | Zero Waste Arlington, Co-Chair | | | |
| Band, Harris | Master Plan Advisory Committee | Boards & Commissions, Town Manager | | |
| Banks, Les | Veterans Council | | | |
| Barber, Heather | Sustainable Transportation, Arlington Business Community | | | |
| Barnicle, Kristen | Board of Youth Services, 2019 | Boards & Commissions | | |
| Baron, Sheri | Master Plan Advisory Committee | Boards & Commissions, Town Manager | | |
| Barr, Joe | Capital Planning Committee | Town Manager | | |
