The City of Westminster is served by some of the United Kingdom's most renowned public and private healthcare facilities.
* **Public Hospitals (NHS):** St Mary’s Hospital in Paddington is the borough's major acute care facility, housing a major trauma center and an A&E department. It is famously the site where Alexander Fleming discovered penicillin. Other notable public facilities include the Chelsea and Westminster Hospital (located just on the borough boundary) and various clinics managed by the Imperial College Healthcare NHS Trust. * **Private Healthcare:** The Marylebone area, specifically Harley Street, is internationally recognized for its concentration of prestigious private medical specialists, clinics, and surgical centers. * **Mental Health:** Services are primarily provided by the Central and North West London NHS Foundation Trust, which operates community clinics and inpatient facilities such as the Gordon Hospital.