Ban Ki-moon is a South Korean politician and diplomat who served as the eighth secretary-general of the United Nations between 2007 and 2016. Prior to his appointment as secretary-general, Ban was the South Korean Minister of Foreign Affairs and Trade between 2004 and 2006. Ban was initially considered to be a long shot for the office of Secretary-General of the United Nations; he began to campaign for the office in February 2006. As the foreign minister of South Korea, he was able to travel to all the countries on the United Nations Security Council, a manoeuvre that subsequently turned him into the campaign's front-runner.

A United Nations Secretary-General selection was held in October 2016 to choose the ninth secretary-general of the United Nations to succeed Ban Ki-moon from 1 January 2017. Six straw polls were held in the Security Council from 21 July 2016 to 5 October 2016. António Guterres of Portugal led the polling in every round, finishing the last round with 13 'encourage' votes, 0 'discourage' votes, and 2 abstentions. On 6 October 2016, the Security Council unanimously recommended Guterres to the General Assembly, which formally selected him by acclamation on 13 October 2016.