Africa has 55 billionaires, far more than previously thought, Nigeria-based Ventures financial magazine says.
They include three women – the mother of Kenya’s president, a daughter of Angola’s president and a Nigerian oil tycoon and fashion designer.
The richest man is Nigeria’s Aliko Dangote, with a fortune of $20.2bn (£12.5bn), Ventures said.
The list is likely to reignite debate about inequality between rich and poor people in Africa, correspondents say.
In April, the World Bank said the number of people living in extreme poverty in Africa had risen in the past three decades from 205 million to 414 million.