| Badik, Adam | Election Modernization Committee, Democratic Town Committee | | | |
| Axelrod Lehrich, Joan | Board of Youth Services | Boards & Commissions, Town Manager | | |
| Auster, Adam | Town Meeting Procedures Committee, Asst. Moderator | Boards & Commissions, Town Manager | | |
| Aslanian, John | TAC, Member At Large | Planning | | |
| Aronow, MaryEllen | Tree Committee, 12/2025 | Boards & Commissions, Town Manager | | |
| Aries, Olivier | Tree Committee, 01/31/2026 | | | |
| Anderson, Kristen | AHNAP, Business Owner | | | |
| Anderson, Jackie | Tree Committee, 06/30/2026 | | | |
| Amstutz, Daniel | Sustainable Transportation, Planning | | | |
| Amstutz, Daniel | Mass Ave/Appleton Design Review Committee, Department of Planning and Community Development | | | damstutz@town.arlington.ma.us |
| Amstutz, Daniel | Parking Advisory Committee, Planning | Boards & Commissions, Town Manager | | |
| Ambreen, Hira | Human Rights Commission, Co-Chair, 2024 | Town Manager | | |
| Almond, Josephine | Youth/Young Adult Study Committee, Arlington Student, Moderator Designee, Co-Chair | | | |
| Allison-Ampe, Kirsi | Long Range Planning Committee | Boards & Commissions | | |
| Allison-Ampe, Kirsi | Budget Revenue Task Force, School Committee | | | |
| Allison-Ampe, Dr. Kirsi | High School Building Committee, School Committee Representative | | | |
| Alessi, John | TAC, Planning & Community Development | Town Manager | | |
| Alessi, John | Bicycle Advisory Committee (ABAC), 6/30/2025 | Town Manager | | |
| Alessi, John | Clean Energy Future | Town Manager | | |
| Aikenhead, Nellie | Clean Energy Future | | | |
