Defence Research and Development Canada is the science and technology organization of the Department of National Defence (DND), whose purpose is to provide the Canadian Armed Forces (CAF), other government departments, and public safety and national security communities with knowledge and technology.

The Department of National Defence is the department of the Government of Canada which supports the Canadian Armed Forces in its role of defending Canadian national interests domestically and internationally. The department is a civilian organization, part of the public service, and supports the armed forces; however, as a civilian organization is separate and not part of the military itself. National Defence is the largest department of the Government of Canada in terms of budget, and it is the department with the largest number of buildings.