
The Inter-Parliamentary Union is an international organization of national parliaments. Its primary purpose is to promote democratic governance, accountability, and cooperation among its members; other initiatives include advancing gender parity among legislatures, empowering youth participation in politics, and sustainable development.

The International Court of Justice (ICJ), sometimes known as the World Court, is one of the six principal organs of the United Nations (UN). It settles disputes between states in accordance with international law and gives advisory opinions on international legal issues. The ICJ is the only international court that adjudicates general disputes between countries, with its rulings and opinions serving as primary sources of international law.

Founded in 1955, the NATO Parliamentary Assembly serves as the consultative interparliamentary organisation for the North Atlantic Alliance. Its current President is Attila Mesterházy from Hungary, elected in 2019. Its current Secretary General is Ruxandra Popa; she has been in this position since January 2020.

The Organization for Security and Co-operation in Europe (OSCE) is the world's largest security-oriented intergovernmental organization. Its mandate includes issues such as arms control, promotion of human rights, freedom of the press, and fair elections. It employs around 3,460 people, mostly in its field operations but also in its secretariat in Vienna, Austria, and its institutions. It has its origins in the 1975 Conference on Security and Co-operation in Europe (CSCE) held in Helsinki, Finland.

The United Nations Peacebuilding Commission (PBC) is a United Nations intergovernmental advisory body of both the General Assembly and the Security Council that supports peace efforts in conflict affected countries. A key addition to the capacity of the international community in the broad peace agenda, it was established in 2005 with the passage of both A/RES/60/180 and S/RES/1645

The Permanent Court of Arbitration (PCA) is an intergovernmental organization located in The Hague, Netherlands. It is not a court in the traditional sense, but provides services of arbitral tribunal to resolve disputes that arise out of international agreements between member states, international organizations or private parties. The cases span a range of legal issues involving territorial and maritime boundaries, sovereignty, human rights, international investment, and international and regional trade. The PCA is constituted through two separate multilateral conventions with a combined membership of 122 states. The organization is not a United Nations agency, but the PCA is an official United Nations Observer.

The United Nations Educational, Scientific and Cultural Organization (UNESCO); French: Organisation des Nations unies pour l'éducation, la science et la culture) is a specialised agency of the United Nations (UN) aimed at promoting world peace and security through international cooperation in education, the sciences, and culture. It has 193 member states and 11 associate members, as well as partners in the nongovernmental, intergovernmental, and private sector. Headquartered in Paris, France, UNESCO has 53 regional field offices and 199 national commissions that facilitate its global mandate.

The United Nations (UN) is an intergovernmental organization that aims to maintain international peace and security, develop friendly relations among nations, achieve international cooperation, and be a centre for harmonizing the actions of nations. It is the largest, most familiar, most internationally represented and most powerful intergovernmental organization in the world. The UN is headquartered on international territory in New York City, with its other main offices in Geneva, Nairobi, Vienna and The Hague.