List of Secretary-General of United Nation |
| No | Secretary-General | Country | Duration | Total Duration |
| 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. |
