It is located in the Roman Catholic Diocese of Norwich and is co-sponsored by the Xaverian Brothers.

Saint Bernard was established in 1956 as an all-girls school in New London, Connecticut.

In addition, another all-girls school named Notre Dame opened in Norwich, Connecticut.

This three-school model only lasted five years due to high operating costs and in 1972, the Norwich diocese closed Notre Dame and St. Bernard Girls' School, merging them with the Boys' school in Uncasville.

[2] The former Notre Dame campus has since served as Three Rivers Community College Mohegan Campus and in the fall of 2008 became Norwich Regional Technical High School.