In Canada, the term separate school refers to a particular type of school that has constitutional status in three provinces (Ontario, Alberta and Saskatchewan) and statutory status in three territories (Northwest Territories, Yukon and Nunavut). In these Canadian jurisdictions, a separate school is one operated by a civil authority—a separate school board—with a mandate enshrined in the Canadian Constitution (for the three provinces) or in federal statutes (for the three territories). In these six jurisdictions a civil electorate, composed of the members of the minority faith, elects separate school trustees according to the province's or territory's local authorities election legislation. These trustees are legally accountable to their electorate and to the provincial or territorial government. No church has a constitutional, legal, or proprietary interest in a separate school. Consequently, a separate school is not a parochial or private school, or a charter school.

The constitutionally provided mandate of a separate school jurisdiction and of a separate school is to provide education in a school setting that the separate school board considers reflective of Roman Catholic (or, rarely, Protestant) theology, doctrine, and practices. This mandate can manifest itself in the Program of Studies and the curriculum, exercises and practices, and staffing. The limits of this mandate are determined by the application of the Canadian Charter of Rights and Freedoms, and judicial decisions.