The Monthly Index of Medical Specialities or MIMS is a pharmaceutical prescribing reference guide published in the United Kingdom since 1959 by Haymarket Media Group.

MIMS is also published internationally by various organisations, including in Australia, New Zealand, China, Hong Kong, India, Indonesia, Japan, Korea, Malaysia, Myanmar, the Philippines, Singapore, Thailand, and Vietnam.

The print title is published quarterly, freely available to all practice-based UK general practitioners, and on a paid basis to subscribers.

Concise drug monographs form the core of MIMS; these include safety information, details of the active ingredient, presentation, price, indication, dosage and manufacturer.

Several one-day clinical conferences are held each year on topics such as dermatology, women's health, diabetes, and respiratory disease.