Jim McLay, New Zealand's representative at the United Nations in New York, will be replaced in May by career diplomat Gerard van Bohemen after Mr McLay's second term ends, Foreign Minister Murray McCully has announced.
By dint of the appointment, Mr van Bohemen will also represent New Zealand on the Security Council for the rest of 2015 and 2016.
Mr Van Bohemen is a deputy secretary at the Ministry of Foreign Affairs and Trade responsible for multilateral and legal affairs.
It is thought he would have been short-listed for the job of Secretary of Foreign Affairs to replace John Allen if he had wanted it, but was keen to return to New York.
He was deputy permanent representative when New Zealand was last on the Security Council in 1993-94.