Mr Tito replaces Kiribati's first representative to the UN Makurita Baaro, who has resigned from her post.
She was appointed to the role in 2013 by former president Anote Tong.
A by-election is to be held in South Tarawa to elect a replacement for Mr Tito.
Mr Tito entered politics in 1987 and from 1994 until 2003 he was the country's president.
Photo: RNZ
