| Sankalia, Priya | | Boards & Commissions, Finance Committee, Select Board, Town Manager | | |
| Stanton, Paul | AHNAP, Chamber of Commerce | | | |
| Samenfeld, Scott | Arlington Cultural Council, Publicity, 4/30/2022 | | | |
| Smith, Scott | Bicycle Advisory Committee (ABAC), 6/30/2025 | | | |
| Shea, Elizabeth | Bicycle Advisory Committee Rep. | | | |
| Simon, Hannah | Board of Youth Services, 2019 | Boards & Commissions | | |
| Susse, Jennifer | Budget Revenue Task Force, School Committee | | | |
| Schlichtman, Paul | Building Committee (PTBC), School Committee Liason | | | |
| Sullivan, Mallory | CDBG Subcommittee, CDBG Administrator | | | Mjsullivan@town.arlington.ma.us |
| Smith, Jean | Cemetery Commission, Secretary | | (781) 316-3276 | |
| Schlichtman, Paul | Chair, School Committee, 2026 | Boards & Commissions, Town Manager | (617) 755-4300 | pschlichtman@arlington.k12.ma.us |
| Swanson, David | Co-Chair, Community Preservation Act Committee, Select Board Appointee | Town Manager | | |
| Stevens, Nathaniel | Conservation Commission | Boards & Commissions | | |
| Skahan, Tracy | Cyrus E. Dallin Museum Trustees | | | |
| Sonin, Juhan | Election Modernization Committee | Town Manager | | |
| Susse, Jennifer | Election Modernization Committee, School Committee Designee | Town Manager | | |
| Susse, Jennifer | Finance Committee (Prct. 3, 2024) | | | |
| Speare, Amy | High School Building Committee, Community Member | | | |
| Stange, Eric | Historical Commission | Boards & Commissions | | |
| Schaefer, Dianne | Historical Commission | Boards & Commissions | | |
