​The Massachusetts Thoracic Society (MTS) is a professional organization of Pulmonary, Critical Care, and Sleep doctors and allied medical professionals, including respiratory therapists and nurses. MTS is a state chapter of the American Thoracic Society. MTS holds an Annual Meeting to provide updates in the state of the art clinical and research progress in Pulmonary and Critical Care Medicine.

The MTS is organized for charitable, educational, and scientific purposes, including but not limited to the dissemination of information and research related to pulmonary health and diseases, critical care, and sleep medicine.