Class R: Medicine is a classification used by the Library of Congress classification system. This article outlines the subclasses of Class R.

R -- Medicine (General)

RA-- Public aspects of medicine

RB-- Pathology

RC-- Internal medicine

RD-- Surgery

RE-- Ophthalmology

RF-- Otorhinolaryngology

RG-- Gynecology and obstetrics

RJ-- Pediatrics

RK-- Dentistry

RL-- Dermatology

RM-- Therapeutics. Pharmacology

RS-- Pharmacy and materia medica

RT-- Nursing

RV-- Botanic, Thomsonian, and eclectic medicine

RX-- Homeopathy

RZ-- Other systems of medicine