| Sonin, Juhan | Election Modernization Committee | Town Manager | | |
| Smith, Stacie Nicole | Remote Participation Study Committee, Secretary | | | |
| Smith, Scott | TAC, Pct 1-7 Rep, Bicycle Advisory Liaison | Boards & Commissions, Town Manager | | |
| Smith, Scott | Bicycle Advisory Committee (ABAC), 6/30/2025 | | | |
| Smith, Jean | Cemetery Commission, Secretary | | (781) 316-3276 | |
| Slotnick, Larry | Zero Waste Arlington | | | |
| Skahan, Tracy | Cyrus E. Dallin Museum Trustees | | | |
| Simon, Hannah | Board of Youth Services, 2019 | Boards & Commissions | | |
| Shoemaker, Linda | Minuteman Bikeway 25th Anniversary Committee | | | |
| Sheppard, Patricia | Local Emergency Planning Committee, Chief Technology Officer | Boards & Commissions, Town Manager | | |
| Shea, Elizabeth | Bicycle Advisory Committee Rep. | | | |
| Shah, Kristine | Sustainable Transportation, HHS | | | |
| Shah, Kristine | Local Emergency Planning Committee, Council on Aging | Boards & Commissions, Town Manager | | |
| Selker, Paul | Master Plan Update Advisory Committee | Town Manager | | |
| Schlichtman, Paul | Chair, School Committee, 2026 | Boards & Commissions, Town Manager | (617) 755-4300 | pschlichtman@arlington.k12.ma.us |
| Schlichtman, Paul | Building Committee (PTBC), School Committee Liason | | | |
| Schiller, Jacob | Semiquincentennial Committee, Menotomy Minute Men | | | |
| Schaefer, Dianne | Historical Commission | Boards & Commissions | | |
| Sawtelle, Steven | Veterans Council (1/31/2018) | | | |
| Savarese, Steve | Realtor, At Large, 2025 | Boards & Commissions, Town Manager | | |
