Saint Mary's Hospital (abbreviated STMH) is a Yale-affiliated urban hospital located at 56 Franklin Street, Waterbury, Connecticut. It was founded in 1907 by the Sisters of Saint Joseph of Chambéry, and it is designated as a Level II trauma center. Saint Mary’s has been a teaching hospital for the Yale University School of Medicine for over 40 years.
In July 2014 Tenet Healthcare announced that the hospital would be acquired by a Tenet subsidiary, with the hospital's religious directives and uncompensated care policies remaining intact. Tenet was chosen by the hospital after a four-year selection process.