Covenant Health Systems (CHS) is a Catholic, not-for-profit healthcare, elder care and social service system formed in 1983 by the Sisters of Charity of Montreal, "Grey Nuns."

CHS has its roots in the charisma and mission of Saint Marguerite d'Youville, foundress of the Sisters of Charity of Montreal, "Grey Nuns." The Sisters first brought healthcare to Toledo, OH in 1855 when they were called to respond to an epidemic in a city then known as "the Black Swamp." This ministry later became Mercy Health - St. Vincent Medical Center. The Sisters subsequently established many more healthcare ministries throughout the United States.

In the early 1990's, motivated by changes in the healthcare delivery system and an aging congregation, the Sisters began a long and well thought out plan to ensure the future of their health care ministries. In 1996, after a two-and-a-half year process, the Grey Nuns received approval from the Holy See to transfer sponsorship of their healthcare facilities to Covenant Health Systems as Covenant became a public juridic person of pontifical right.

Today, CHS serves as sponsor, governance organization and manager of multiple health and elder care-related organizations throughout New England. CHS believes in a future of hope and its challenge is to preserve and amplify the mission of quality and service in new and innovative ways. In its Vision 2000 statement, CHS has made a commitment to actively engage in partnerships with others to improve the health and well being of communities served. CHS also serves as one of five co-sponsors of Catholic Healthcare Partners.