U Thant ( \ / ˌuː ˈθɑːnt \ / ; Burmese : ဦ သန ; MLCTS : u : san . ; Burmese pronunciation : ( ʔú θa̰ɴ ) ; January 22 , 1909 - November 25 , 1974 ) was a Burmese diplomat and served as the third Secretary-General of the United Nations , from 1961 to 1971 .
U Thant ( 22 January 1909 - 25 November 1974 ) was a Burmese diplomat and the third Secretary-General of the United Nations , from 1961 to 1971 .