Beginning with a historical review of Canada's role in the development of international criminal law from the post-World War II prosecutions to the late 1980s, the paper turns to an examination of Canada's engagement with international criminal law from the early 1990s to the present, explained through Canada's international actions on the International Criminal Court and other international institutions. Over the past two decades, Canada has been deeply involved in the development and implementation of international criminal law abroad, providing legal, financial and political support to particular tribunals at particular periods. However, this support has shifted over time, leaving gaps in the substantive commitment. The paper discusses Canada's engagement with international criminal law at home, in particular through Canada's passage of the Crimes Against Humanity and War Crimes Act in 2000. However, Canada's Crimes Against Humanity and War Crimes Program has remained arguably under