| List of Secretary-General of United Nation |
| No |
Secretary-General |
Country |
Duration |
Total Duration |
| acting |
Gladwyn Jebb |
|
|
101 days |
| 1 |
Trygve Lie |
Norway |
Feb. 1, 1946–April 10, 1953 |
6 years, 282 days |
| 2 |
Dag Hammarskjöld |
Sweden |
April 10, 1953–Sept. 18, 1961 |
8 years, 161 days |
| 3 |
U Thant |
Myanmar (Burma) |
Nov. 30, 1962–Dec. 31, 1971 |
10 years, 31 days |
| 4 |
Kurt Waldheim |
Austria |
Jan. 1, 1972–Dec. 31, 1981 |
10 years |
| 5 |
Javier Pérez de Cuéllar |
Peru |
Jan. 1, 1982–Dec. 31, 1991 |
10 years |
| 6 |
Boutros Boutros-Ghali |
Egypt |
Jan. 1, 1992–Dec. 31, 1996 |
5 years |
| 7 |
Kofi Annan |
Ghana |
Jan. 1, 1997–Dec. 31, 2006 |
10 years |
| 8 |
Ban Ki-moon |
South Korea |
Jan. 1, 2007–Dec. 31, 2016 |
10 years |
| 9 |
António Guterres |
Portugal |
Jan. 1, 2017– |
Ongoing. |