The 193 member states of the powerful General Assembly adopted the resolution by acclamation, appointing 67-year-old Guterres as the 9th UN Secretary-General to take over from Ban Ki-moon, whose tenure will end on December 31.
The 15-nation UN Security Council had last week voted for Guterres by acclamation and forwarded his name to the General Assembly.
Guterres, who was Prime Minister of Portugal from 1995 to 2002, and the UN High Commissioner for Refugees from June 2005 to December 2015, will assume his new role on January 1, 2017 for a five-year term that can be renewed by Member States for an additional five years.
"Secretary-General-elect Guterres is well known to all of
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us in the hall. But he is perhaps best known where it counts most: on the frontlines of armed conflict and humanitarian suffering," Ban said referring to Guterres' time as head of the UN refugee agency.
"His past experience as Prime Minister of Portugal, his wide knowledge of world affairs and his lively intellect will serve him well in leading the United Nations in a crucial period," he had said.
Speaking in Lisbon shortly after his selection last week, Guterres had expressed "gratitude and humility" and had vowed to "serve" those most vulnerable, including victims of conflict, terrorism, violation of rights and poverty.
Guterres had said the Secretary-General of the UN should "actively, consistently and tirelessly" exercise his good offices and mediation capacity as an honest broker, bridge builder and messenger of peace.
He had noted that prevention is also crucial to combat terrorism and the international community has the "legal right and moral duty" to act collectively to put an end to terrorism "in all its forms and manifestations".
The last five Secretaries-General were appointed by the Assembly through a resolution adopted by consensus. A vote takes place only if a Member State requests it and a simple majority of those voting would be required for the Assembly to adopt the resolution. If a vote is taken, it will be by secret ballot.
The UN Charter, signed in 1945 as the foundation of the Organisation, says relatively little about how a Secretary- General is to be selected, aside from Article 97, which notes that the candidate "shall be appointed by the General Assembly upon the recommendation of the Security Council".
Russia's envoy to the UN and President of the Council for October Vitaly Churkin had told reporters that Guterres has "many strong qualities" to lead the UN.
"I sensed in my conversations with other members of the Security Council and various members of the UN that Guterres has great UN credentials having been High Commissioner for Refugees for 10 years," he had said, adding in this position Guterres has seen "most gruesome conflicts" the world has to deal with.
"He is a person who talks to everyone, listens to everyone and speaks his mind. Very outgoing person so i think it was a great choice," Churkin had said last week.
In addition, this past July, the UN held its first-ever globally televised and webcast townhall-style debate in the General Assembly Hall, where the confirmed candidates at the time took questions from diplomats and the public at large.