"We are living in the age of the mega-crisis. But, as this report clearly demonstrates, the gap in funding is a solvable problem," Ban said.
Up to 13.5 Syrians need $8 billion in aid, according to UN Under-Secretary-General for Humanitarian Affairs Stephen O’Brien’s estimate last month.
O’Brien said over the summer that 4.6 million South Sudanese displaced by a two-year civil war are in need of a further $1 billion.
"We need fresh thinking and the determination to take bold decisions," Ban said, thanking the high-level panel for shaping the priorities of the World Humanitarian Summit in Istanbul scheduled for May.
The report offers solutions to closing the funding gap, including expanding the resource base through public-private partnerships, building resilience and self-reliance in fragile states and improving the efficiency of deliveries.