| Kelley, Kevin | Local Emergency Planning Committee, AFD Chief/EMD Director | Boards & Commissions, Town Manager | | |
| Kiernan, Brendan | Local Emergency Planning Committee, APD Captain | Boards & Commissions, Town Manager | | |
| Kenig Scher, Lidia | Poet Laureate Committee, ACAC Designee | Boards & Commissions, Town Manager | | |
| Kalauskas, Charles | Master Plan Implementation Committee | Boards & Commissions | | |
| Kelder, Brian | Open Space Committee, Resident | Boards & Commissions | | |
| Katofsky, Ryan | High School Building Committee | | | |
| Kelley, Kevin | Municipal Vulnerability Preparedness, Arlington Fire Chief | | | |
| Krinsky, Lisa | LGBTQIA+ Rainbow Commission, 2024 | | | |
| Kelleher, Karen | Housing Plan Implementation Committee | | | |
| Kmetz, Sarah | Zero Waste Arlington | | | |
| Katofsky, Ryan | Clean Energy Future, Chair | | | |
| Kowalczuk, Mary | Appointed by the Town Moderator | Town Manager | | |
| Kaplan, Dave | Conservation Commission | | | |
| Krepelka, Marie | Civilian Police Advisory Board Study Committee, Select Board Designee | | | |
| Kriketos , S. Nicholas | Mass Ave/Appleton Design Review Committee, St. Athanasius the Great Greek Orthodox Church | | | |
| Kelleher, Karen | Affordable Housing Trust Fund Board | Town Manager | | |
| Klein Collins, Mara | Council on Aging, Associate | | | |
| Key, Laurie | Human Rights Commission, 2024 | Boards & Commissions, Town Manager | | |
| Korman-Houston, Shaina | Redevelopment Board (1/31/2026) | | | SKorman-Houston@town.arlington.ma.us |
| Kenschaft, Lori | Energy Advocate | | | |
