The National Institute of Medical Herbalists (NIMH) is a professional body regulating medical herbalists in the United Kingdom. It was first established as the National Association of Medical Herbalists in 1864 by a group of herbalists from the north of England, but currently has members worldwide. Members have undergone a lengthy training program before registering as qualified medical herbalists. Practitioners train for at least three years at degree level including over 500 hours of clinical practice, and adhere to a strict code of conduct before they can gain MNIMH or FNIMH after their name. NIMH-registered medical herbalists are trained in the same diagnostic skills as mainstream doctors and take a holistic approach to health. Its official journal is the Journal of Herbal Medicine.
NIMH has approximately 500 active and 300 non-active members and organizes annual conferences.