The Connecticut State Medical Society (CSMS) is a professional organization for physicians in the U.S. state of Connecticut. It was founded as the Connecticut Medical Society in 1792. The Society was involved in the creation of many of Connecticut's medical institutions, including the Medical Institution of Yale College (now the Yale School of Medicine), the New Haven Hospital (now Yale New Haven Hospital), and the Hartford Retreat for the Insane (now the Institute of Living). The CSMS belongs to a network of county and state medical societies, as well as the American Medical Association.