No

Secretary-General

Dates in office

-

Sir Gladwyn Jebb (acting)

24 October 1945 – 1 February 1946

1

Trygve Halvdan Lie

1 February 1946 – November 1952

2

Dag Hammarskjöld

10 April 1953 – 18 September 1961

3

U Thant

3 November 1961 – 31 December 1971

4

Kurt Waldheim

1 January 1972 – 31 December 1981

5

Javier Pérez de Cuéllar

1 January 1982 – 31 December 1991

6

Boutros Boutros-Ghali

1 January 1992 – 31 December 1996

7

Kofi Annan

1 January 1997 – 31 December 2006

8

Ban Ki-moon

1 January 2007 – 31 December 2016

9

António Guterres

1 January 2017 – Incumbent