The North American Invitational Model United Nations (NAIMUN) is one of the oldest UN simulations for high school students in North America and the world. Since 1963, the conference has been a forum in which a dynamic range of young students come from around the world to seek, through discussion, negotiation and debate, solutions to the various problems of the world. The 3,000+ participants convene for four days, simulating their role as delegates to the United Nations from a particular nation and serving as representatives of that country's policies. NAIMUN runs over 35 mini-simulations, including standard committees from the UN General Assembly, the Economic and Social Council and the Security Council, as well as crisis simulations of various regional organizations, national cabinets and political organizations.

The conference is organized by the Georgetown International Relations Association, Inc., a non-profit organizations that seeks to introduce potential leaders to the fundamentals of international relations, enabling them to face the challenges of tomorrow. In NAIMUN's stimulating learning environment, delegates are challenged to address global issues and conflicts. Students are pushed to heighten their understanding of the international system from both political and legal perspectives, while also testing their negotiation, judgment, and problem-solving skills. The conference and the corporation are staffed and managed by over 200 undergraduate students with keen interest and substantial understanding of international relations from Georgetown University.