United Nations Secretaries-General: Chronological Order and Detailed Notes

 

The Secretary-General of the United Nations is the head of the UN Secretariat and serves as the organisation’s chief administrative officer. Under Article 97 of the UN Charter, the Secretary-General is appointed by the General Assembly on the recommendation of the Security Council. The normal term is five years, and a Secretary-General may be reappointed. 


Since the establishment of the United Nations in 1945, nine people have served as Secretary-General. António Guterres has been the ninth Secretary-General since 1 January 2017. 


Chronological List


No. Secretary-General Period


1 Trygve Lie 1946–1952

2 Dag Hammarskjöld 1953–1961

3 U Thant 1961–1971

4 Kurt Waldheim 1972–1981

5 Javier Pérez de Cuéllar 1982–1991

6 Boutros Boutros-Ghali 1992–1996

7 Kofi Annan 1997–2006

8 Ban Ki-moon 2007–2016

9 António Guterres 2017–Present








1. Trygve Lie — 1946–1952


Trygve Lie became the first Secretary-General of the United Nations.


Term: 1 February 1946 – 10 April 1953


He resigned from office in 1952, although the official period of his tenure extended into April 1953.


He served during the early formative years of the UN.


His tenure coincided with the beginning of the Cold War.


Important international developments during his period included the Korean War and the development of the early UN system.



Exam Facts


First UN Secretary-General: Trygve Lie


First Secretary-General: 1946


Resigned: 1952



The UN's archival records give his precise service period as 1 February 1946–10 April 1953. 





2. Dag Hammarskjöld — 1953–1961


Dag Hammarskjöld became the second Secretary-General in 1953.


Term began: 11 April 1953


Died in office: 17 September 1961


His tenure was strongly associated with the development of modern UN peacekeeping.


He worked to strengthen the independence and international role of the Secretary-General.


He died in an aircraft crash in Africa while travelling on a peace mission.



Important Exam Fact


Dag Hammarskjöld was the only UN Secretary-General to die while serving in office. 


His death occurred during an attempt to help resolve the Congo Crisis.





3. U Thant — 1961–1971


U Thant became the third Secretary-General.


Acting Secretary-General: November 1961


Formally appointed Secretary-General: November 1962


Served until: December 1971


He succeeded Dag Hammarskjöld.


His tenure covered major Cold War crises.



One of the most important events associated with his tenure was the Cuban Missile Crisis of 1962.


He also dealt with conflicts and decolonisation issues during a period when many newly independent states were joining the UN.


Exam Facts


Third Secretary-General: U Thant


Acting Secretary-General from: November 1961


Formal appointment: November 1962


Term ended: December 1971



The UN specifically distinguishes his initial appointment as acting Secretary-General from his formal appointment in 1962. 





4. Kurt Waldheim — 1972–1981


Kurt Waldheim became the fourth Secretary-General in 1972.


Term: 1972–1981


He served two five-year terms.


His tenure included major international issues associated with the Cold War and conflicts in the Middle East and elsewhere.


The UN continued to expand its diplomatic and peacekeeping activities during this period.



Exam Facts


Fourth Secretary-General: Kurt Waldheim


Term: 1972–1981


Served two terms.



The UN Archives records his tenure as 1 January 1972–31 December 1981. 





5. Javier Pérez de Cuéllar — 1982–1991


Javier Pérez de Cuéllar became the fifth Secretary-General in 1982.


Term: 1982–1991


Served two terms.


His tenure covered the final decade of the Cold War.


The UN played important diplomatic roles in several international conflicts during this period.



His period also included important developments in international diplomacy and peace negotiations.


Exam Facts


Fifth Secretary-General: Javier Pérez de Cuéllar


Term: 1982–1991


Served two terms.


His tenure ended shortly before the major post-Cold War transformation of international politics.








6. Boutros Boutros-Ghali — 1992–1996


Boutros Boutros-Ghali became the sixth Secretary-General in 1992.


Term: 1992–1996


He served during the period immediately following the end of the Cold War.


The UN became increasingly involved in peacekeeping and post-conflict reconstruction.


His period included major conflicts and humanitarian crises in different parts of the world.



A major document associated with his tenure was “An Agenda for Peace” (1992), which discussed ways to strengthen preventive diplomacy, peacemaking and peacekeeping.


Important Exam Fact


Boutros Boutros-Ghali was the first African Secretary-General.


His term lasted only one five-year period. 





7. Kofi Annan — 1997–2006


Kofi Annan became the seventh Secretary-General in 1997.


Term: 1997–2006


He served two terms.


He was the first Secretary-General to rise from within the UN system after a long career in the organisation.


His tenure placed strong emphasis on UN reform, development, human rights and international cooperation.



Nobel Peace Prize


In 2001, the Nobel Peace Prize was awarded jointly to Kofi Annan and the United Nations for their work for a better organised and more peaceful world.


Important Exam Facts


Seventh Secretary-General: Kofi Annan


Term: 1997–2006


Nobel Peace Prize: 2001


First Secretary-General from sub-Saharan Africa



His official UN tenure was from January 1997 to December 2006. 





8. Ban Ki-moon — 2007–2016


Ban Ki-moon became the eighth Secretary-General on 1 January 2007.


Term: 2007–2016


Served two terms


Before becoming Secretary-General, he was the Foreign Minister of South Korea.


His tenure placed significant emphasis on:


Climate change


Sustainable development


Peace and security


Humanitarian issues


Gender equality




Important Development


During his tenure, the international community adopted the:


Sustainable Development Goals (SDGs) in 2015.


The 2030 Agenda for Sustainable Development established 17 Sustainable Development Goals.


Exam Facts


Eighth Secretary-General: Ban Ki-moon


Term: 2007–2016


SDGs adopted: 2015


Number of SDGs: 17



The UN Archives confirms that Ban Ki-moon served from January 2007 to December 2016. 





9. António Guterres — 2017–Present


António Guterres became the ninth Secretary-General of the United Nations on 1 January 2017.


First term: 2017–2021


Second term: 2022–2026


He was previously the Prime Minister of Portugal.


His UN agenda has included:


Climate change


Sustainable development


International peace and security


Humanitarian crises


Refugees and migration


Multilateral cooperation




The UN identifies António Guterres as the current Secretary-General and states that he took office on 1 January 2017. 


Important Exam Fact


António Guterres is the ninth Secretary-General of the United Nations.





Complete Chronology for Quick Revision


1946–1952


Trygve Lie



1953–1961


Dag Hammarskjöld



1961–1971


U Thant



1972–1981


Kurt Waldheim



1982–1991


Javier Pérez de Cuéllar



1992–1996


Boutros Boutros-Ghali



1997–2006


Kofi Annan



2007–2016


Ban Ki-moon



2017–Present


António Guterres







Important Facts for ADRE/APSC/SSC/UGC NET


1. First UN Secretary-General → Trygve Lie



2. Second Secretary-General → Dag Hammarskjöld



3. Third Secretary-General → U Thant



4. Fourth Secretary-General → Kurt Waldheim



5. Fifth Secretary-General → Javier Pérez de Cuéllar



6. Sixth Secretary-General → Boutros Boutros-Ghali



7. Seventh Secretary-General → Kofi Annan



8. Eighth Secretary-General → Ban Ki-moon



9. Ninth Secretary-General → António Guterres



10. Secretary-General who died in office → Dag Hammarskjöld



11. Secretary-General associated with “An Agenda for Peace” → Boutros Boutros-Ghali



12. Secretary-General who shared the 2001 Nobel Peace Prize with the UN → Kofi Annan



13. Secretary-General during adoption of SDGs in 2015 → Ban Ki-moon



14. Secretary-General since 2017 → António Guterres



15. Number of UN Secretaries-General since 1945 → 9



16. UN Secretary-General is appointed by → General Assembly



17. Appointment is made on recommendation of → Security Council



18. Relevant UN Charter provision → Article 97



19. Normal term → 5 years



20. UN Secretariat is headed by → Secretary-General




The UN describes the Secretary-General as both the head of the Secretariat and a diplomat, advocate, civil servant and administrator; the position has developed beyond the limited wording of the Charter through established practice. 




Sources


United Nations — Secretary-General


UN Archives and Records Management Section


UN Charter, Article 97


United Nations Essential Guidebook


United Nations official biographies 

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