The secretary-general of the United Nations (UNSG or UNSECGEN) is the chief administrative officer of the United Nations and head of the United Nations Secretariat, one of the six principal organs of the United Nations.
The role of the secretary-general and of the secretariat is laid out by Chapter XV (Articles 97 to 101) of the United Nations Charter. However, the office's qualifications, selection process and tenure are open to interpretation; they have been established by custom.
In the United Nations, the Post-2015 Development Agenda was a set of talks and discussions that led to the creation of the 2016 Sustainable Development Goals. This replaced the 2015 Millennium Development Goals.
In January 2013, the 30-member UN General Assembly Open Working Group on Sustainable Development Goals was established to identify specific goals for the SDGs. The Open Working Group (OWG) was tasked with preparing a proposal on the SDGs for consideration during the 68th session of the General Assembly, September 2013 – September 2014. On 19 July 2014, the OWG forwarded a proposal for the SDGs to the Assembly. After 13 sessions, the OWG submitted their proposal of 8 SDGs and 169 targets to the 68th session of the General Assembly in September 2014. On 5 December 2014, the UN General Assembly accepted the secretary general's Synthesis Report, which stated that the agenda for the post-2015 SDG process would be based on the OWG proposals.
The United Nations Secretariat is one of the six principal organs of the United Nations (UN), The secretariat is the UN's executive arm. The secretariat has an important role in setting the agenda for the deliberative and decision-making bodies of the UN (i.e., the General Assembly, Economic and Social Council, and Security Council), and the implementation of the decision of these bodies. The secretary-general, who is appointed by the General Assembly, is the head of the secretariat.
The mandate of the secretariat is a wide one. Dag Hammarskjöld, the UN's second secretary-general, described its power as follows: "The United Nations is what member nations made it, but within the limits set by government action and government cooperation, much depends on what the secretariat makes it. It has creative capacity. It can introduce new ideas. It can, in proper forms, take initiatives. It can put before member governments findings which will influence their actions". The United Nations Department of Political Affairs, which has a role analogous to a ministry of foreign affairs, is a part of the secretariat. So is the Department of Peace Operations. The secretariat is the main source of economic and political analysis for the General Assembly and Security Council; it administers operations initiated by UN's deliberative organs, operates political missions, prepares assessments that precede peacekeeping operations, appoints the heads of peacekeeping operations, conducts surveys and research, communicates with non-state actors such as media and non-government organizations, and is responsible for publishing all of the treaties and international agreements.
United Nations General Assembly (UNGA or GA) is one of the six principal organs of the United Nations (UN), serving as its main deliberative, policymaking, and representative organ. Currently in its 80th session, its powers, composition, functions, and procedures are set out in Chapter IV of the United Nations Charter.
The UNGA is responsible for the UN budget, appointing the non-permanent members to the Security Council, appointing the secretary-general of the United Nations, receiving reports from other parts of the UN System, and making recommendations through resolutions. It also establishes numerous subsidiary organs to advance or assist in its broad mandate. The UNGA is the only UN organ where all member states have equal representation.
The United Nations Sustainable Development Group (UNSDG), previously the United Nations Development Group (UNDG), is a group of 37 United Nations funds, programmes, specialized agencies, departments and offices that play a role in development. It was created by the secretary-general of the United Nations in order to improve the effectiveness of United Nations development activities at the country level.
Its strategic priorities are to respond to the Triennial Comprehensive Policy Review (TCPR) – which became in 2008 the Quadrennial comprehensive policy review (QCPR) – and global development priorities, as well as to ensure the UN development system becomes more internally focused and coherent. The UNSDG strategic priorities give direction to UNSDG members' efforts at the global, regional and country level to facilitate a step change in the quality and impact of UN support at the country level. The UNSDG (at the time the UNDG) was one of the main UN actors involved in the development of the Post-2015 Development Agenda, which led to the creation of the Sustainable Development Goals. The UNDG was renamed as the UNSDG around January 2018.
The United Nations System consists of the United Nations' six principal bodies (the General Assembly, Security Council, Economic and Social Council (ECOSOC), Trusteeship Council, International Court of Justice (ICJ), and the United Nations Secretariat), the specialized agencies and related organizations. The UN System includes subsidiary bodies such as the separately administered funds and programmes, research and training institutes, and other subsidiary entities. Some of these organizations predate the founding of the United Nations in 1945 and were inherited after the dissolution of the League of Nations.
The executive heads of some of the United Nations System organizations, and the World Trade Organization, which is not formally part of the United Nations System, have seats on the United Nations System Chief Executives' Board for Coordination (CEB). This body, chaired by the secretary-general of the United Nations, meets twice a year to co-ordinate the work of the organizations of the United Nations System.
The Palace of Nations (French: Palais des Nations, pronounced [palɛ de nɑsjɔ̃]) is the home of the United Nations Office at Geneva, located in Geneva, Switzerland. It was built between 1929 and 1938 to serve as the headquarters of the League of Nations. It has served as the home of the United Nations Office at Geneva since 1946 when the secretary-general of the United Nations signed a Headquarters Agreement with the Swiss authorities, although Switzerland did not become a member of the United Nations until 2002.
In 2012, the Palace of Nations hosted more than 10,000 intergovernmental meetings.
There are six official languages used in United Nations (UN) meetings and in which the UN writes and publishes all its official documents. In 1946, five languages were chosen as official languages of the UN: English, French, Russian, Spanish, and Chinese. In 1973, Arabic was voted to be an additional official language. As of 2025, the official languages of the United Nations are:
According to the UN Charter each of these six languages is equally authoritative although English and French have traditionally received preferential status and are the only two official and working languages of the UN Secretariat. It is an unspoken rule that the UN Secretary General and other high ranking United Nations officials must be fluent (at least C1 – Advanced fluency level according to the Common European Framework of Reference for Languages / CEFRL) in at least English and French. The UN has struggled to provide parity of all 6 languages as the English language has become the dominant world language in the digital age.
Dag Hjalmar Agne Carl Hammarskjöld (English: /ˈhæmərʃʊld/ HAM-ər-shuuld, Swedish: [ˈdɑːɡ ˈhâmːarˌɧœld] ; 29 July 1905 – 18 September 1961) was a Swedish economist and diplomat who served as the second secretary-general of the United Nations from April 1953 until his death in a plane crash in September 1961. As of 2025, he remains the youngest person to have held the post, having been only 47 years old when he was elected. He was a son of Hjalmar Hammarskjöld, who served as Prime Minister of Sweden from 1914 to 1917.
Hammarskjöld's tenure was characterized by efforts to strengthen the newly-formed UN both internally and externally. He led initiatives to improve morale and organizational efficiency while seeking to make the UN more responsive to global issues. He presided over the creation of the first UN peacekeeping forces in Egypt (the UNEF) and the Congo (the ONUC) and personally intervened to defuse or resolve diplomatic crises. Hammarskjöld's second term was cut short when he died in a plane crash while en route to cease-fire negotiations during the Congo Crisis.
The United Nations Department of Political and Peacebuilding Affairs (DPPA) is a department of the Secretariat of the United Nations (UN) with responsibility for monitoring and assessing global political developments and advising and assisting the UN secretary-general and his envoys in the peaceful prevention and resolution of conflict around the world. The department manages field-based political missions in Africa, Central Asia, and the Middle East, and has been increasing its professional capacities in conflict mediation and preventive diplomacy. DPPA also oversees UN electoral assistance to Member States of the organization. Established in 1992, the department's responsibilities also include providing secretariat support to the UN Security Council and two standing committees created by the General Assembly concerning the Rights of the Palestinian People and Decolonization. DPPA is based at the UN headquarters in New York City.