Who we are

This image shows the counties that St. Mary's serves.

Located in the heart of Kitchener, Ontario, St. Mary’s is the second-largest acute care hospital in the St. Joseph’s Health System and a Regional Cardiac Care Centre. We proudly serve the residents of Waterloo, Wellington County, and extend our reach to Dufferin, Grey-Bruce and beyond.

Our nearly 2,000 staff, physicians and volunteers provide excellent, compassionate care to hundreds of thousands of patients and families every year in our core areas of clinical focus:

St. Mary’s core programs and services are provided at our main hospital site. Our community-based programs and services are offered at a number of locations throughout Waterloo Region and Cambridge. Click here for a list of our main site and program addresses.

St. Mary’s has been a cornerstone in the community since 1924, providing patient-centred care in the tradition of our founders, the Sisters of St. Joseph of Hamilton. In addition to serving our local community, our staff and physicians work to advance care through the St. Joseph’s Health System International Outreach Program (IOP), serving in Haiti, Uganda and beyond.

Learn more about:

How to Contact Us

Hospital Switchboard: 519-744-3311
Direct-dial Contacts: 519-749-6578 + extension (4 digits)
Administrative Offices Facsimilie: 519-749-6426
Leadership Team
Full Hospital Directory