Psilocybin Laws in Massachusetts

Current Legal Status

Decriminalized in Multiple Cities

Psilocybin remains a controlled substance under Massachusetts law. However, four cities have passed deprioritization resolutions, and a statewide ballot initiative was filed for the 2026 ballot with support from mental health advocates and veterans groups.

Key Legislation

Somerville City Council resolution (January 2021) — first Massachusetts city to deprioritize entheogen enforcement. Cambridge, Northampton, Easthampton, Amherst, and Salem have all followed. HD 3601 (2025) statewide therapeutic access bill introduced in the Massachusetts Legislature. **March 2026:** two major research pilot bills, **H.4200** and **H.2203**, advanced through committee and are currently moving through the health care financing committees — the most active legislative position Massachusetts psilocybin reform has ever held.

Decriminalization

Somerville, Cambridge, Northampton, Amherst, Easthampton, and Salem have passed resolutions making psilocybin enforcement the lowest priority. These are policy directives, not laws, but meaningfully reduce enforcement risk for personal possession in those cities.

Clinical Trials

Harvard Medical School, McLean Hospital, and Massachusetts General Hospital are conducting psilocybin research. Multiple trials enrolling in the Boston area.

Advocacy Organizations

Bay Staters for Natural Medicine, Massachusetts Psychedelic Society, Healing Advocacy Fund, MAPS.

Related Resources

See how Massachusetts compares to neighboring states and find therapy options for residents:

• Full Legal Status Map
• How to Find a Psilocybin Therapist
• Vendor & Service Center Directory
• People of the U.S. Psilocybin Movement
• Societies, Clubs & Organizations
• Legal Models & Frameworks