U Thant (Burma) served as the third Secretary-General from 1961-1971.![Portrait of former Secretary-General U Thant. UN Photo #UN7736733.](https://libapps.s3.amazonaws.com/accounts/180032/images/UN7736733.jpg)
Note on U Thant's appointment: The resolution of the Security Council recommending U Thant's appointment in 1962 was never assigned a resolution number. For further details, see, Sievers and Daws, Procedure of the UN Security Council, Chapter 7, Section 3, updated April 2018.