Dag Hjalmar Agne Carl Hammarskjöld dÉ?Ë?É¡ ²hamarË?ɧœld29 July 1905 – 18 September 1961) was a Swedish diplomat, economist, and author, who served as the second Secretary-General of the United Nations, from April 1953 until his death in a plane crash in September 1961. At the age of 56 years and 255 days, Hammarskjöld was the youngest to have held the post. Additionally, he is one of only four people to be awarded a posthumous Nobel Prize and was the only United Nations Secretary-General to die while in office. He was killed in a Douglas DC-6 airplane crash en route to cease-fire negotiations. Hammarskjöld has been referred to as one of the two best secretaries-general, and his appointment has been mentioned as the most notable success for the UN. United States President John F. Kennedy called Hammarskjöld "the greatest statesman of our century."

Hammarskjöld posthumously received the Nobel Peace Prize in 1961, having been nominated before his death.  He is credited with saying: "I would rather live my life as though there is a God and die to find out that there isn't, than to live my life as though there is no God and die to find out there is."

This is a Medallion by the sculptor Harald Salomon issued in Denmark 1962 to help financing the Danish Foreign Aid Program.