=> The Secretary-General of the United Nations (UNSG or just SG) is the head of the United Nations Secretariat, one of the six principal organs of the United Nations. The Secretary-General serves as the chief administrative officer of the United Nations. The role of the United Nations Secretariat, and of the Secretary-General in particular, is laid out by Chapter XV (Articles 97 to 101) of the United Nations Charter.
As of 2018, the Secretary-General is Antonio Guterres, appointed by the General Assembly on 13 October 2016.
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ROLE OF CHIEF SECRETARY ON UNO
The Charter describes the Secretary-General as “chief administrative officer” of the Organization, who shall act in that capacity and perform “such other functions as are entrusted” to him or her by the Security Council, General Assembly, Economic and Social Council and other United Nations organs. The Charter also empowers the Secretary-General to “bring to the attention of the Security Council any matter which in his opinion may threaten the maintenance of international peace and security”. These guidelines both define the powers of the office and grant it considerable scope for action. The Secretary-General would fail if he did not take careful account of the concerns of Member States, but he must also uphold the values and moral authority of the United Nations, and speak and act for peace, even at the risk, from time to time, of challenging or disagreeing with those same Member States.
List of Chief Secretaries of UNO are listed Down