The Royal Medical and Chirurgical Society of London (RMCS), created in 1805 as the Medical and Chirurgical Society of London, was a learned society of physicians and surgeons, that received a Royal charter in 1834, and a supplement charter in 1907 to create the newly merged Royal Society of Medicine.

The Royal Society of Medicine (RSM) is a medical society based at 1 Wimpole Street, London, UK. It is a registered charity, with admission through membership.