The Structure of the North Atlantic Treaty Organization is complex and multi-faceted. The decision-making body is the North Atlantic Council (NAC), and the member state representatives also sit on the Defence Policy and Planning Committee (DPPC) and the Nuclear Planning Group (NPG). Below that the Secretary General of NATO directs the civilian International Staff, that is divided into administrative divisions, offices and other organizations. Also responsible to the NAC, DPPC, and NPG are a host of committees that supervise the various NATO logistics and standardisation agencies.

The North Atlantic Treaty Organization, also called the North Atlantic Alliance, is an intergovernmental military alliance of 32 member states—30 European and 2 North American. Established in the aftermath of World War II, the organization implements the North Atlantic Treaty, signed in Washington, D.C., on 4 April 1949. NATO is a collective security system: its independent member states agree to defend each other against attacks by third parties. During the Cold War, NATO operated as a check on the threat posed by the Soviet Union. The alliance remained in place after the dissolution of the Soviet Union and the Warsaw Pact, and has been involved in military operations in the Balkans, the Middle East, South Asia and Africa. The organization's motto is animus in consulendo liber. The organization's strategic concepts include deterrence.