This is a list of Secretaries-General of the United Nations by longevity. Where the person in question is still living, the longevity is calculated up to 16 February 2012.
| Rank | Secretary-General | Date of Birth | Date of Death | Longevity (Years/Days) |
|---|---|---|---|---|
| 1 | Javier Pérez de Cuéllar | 19 January 1920 | 92 years, 40 days | |
| 2 | Boutros Boutros-Ghali | 14 November 1922 | 89 years, 106 days | |
| 3 | Kurt Waldheim | 21 December 1918 | 14 June 2007 | 88 years, 175 days |
| 4 | Kofi Annan | 8 April 1938 | 73 years, 326 days | |
| 5 | Trygve Lie | 16 July 1896 | 30 December 1968 | 72 years, 167 days |
| 6 | Ban Ki-Moon | 13 June 1944 | 67 years, 260 days | |
| 7 | U Thant | 22 January 1909 | 25 November 1974 | 65 years, 307 days |
| 8 | Dag Hammarskjöld | 29 July 1905 | 18 September 1961 | 56 years, 51 days |