| 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 | | |
| Barr, Joseph | Master Plan Advisory Committee | Boards & Commissions, Town Manager | | |
| Barr, Joseph | Master Plan Implementation Committee | Boards & Commissions | | |
| Barry, Charles | Historic Districts Commission, At-Large, 6/2026 | Boards & Commissions, Town Manager | | |
| Bauer, Kristen | Human Rights Commission, 2024 | Boards & Commissions | | |
| Bayer, Paul | Information Technology Advisory Committee | Boards & Commissions, Town Manager | | |
| Beauchemin, Crystal | Human Rights Commission, 2025 | Boards & Commissions | | |
