The History and Administration of Third‐Party Interventions at the Supreme Court of Canada

Abstract This article presents a descriptive account of how the administration of third‐party interventions at the Supreme Court of Canada has evolved since 1878. Although there has been an explosion of intervener participation over the past decade, the Court remains divided on how best to regulate their participation. To better understand the contemporary intervener landscape, this article provides a novel periodization of the rules and norms governing interventions at the Supreme Court. The article concludes that the governance of intervention is not an apolitical exercise, but rather reflects the ideas, interests, and identities on the Court at a given time.