Who is the head of the UN Secretariat?

The head of the UN Secretariat is the Secretary-General. This position is crucial as the Secretary-General serves as the chief administrative officer of the United Nations, overseeing its operations and administering its day-to-day functions. The Secretary-General represents the organization and may take initiatives in areas related to peace and security, human rights, and other international issues.

The role involves not just administrative duties, but also plays a symbolic and diplomatic role, acting as a spokesperson for the global community and a mediator in international conflicts. The Secretary-General coordinates various UN efforts and is expected to provide leadership in promoting peace and stability worldwide.

In contrast, the other roles mentioned do not have similar responsibilities. The Chief Justice of the International Court of Justice, while important for legal matters, is not involved in the administrative functions of the UN as a whole. The President of the General Assembly oversees the assembly sessions but does not manage the UN's broader administrative tasks. The Leader of the Security Council, whose role is to guide discussions and decisions on matters of international peace and security, also does not occupy the administrative head position that the Secretary-General holds.