It was calculated that the average New Zealand adult owns US$299,000 ($422,700), up US$34,000 on last year. This means it jumps the United Kingdom, Singapore and Belgium in the rankings.
When revised for median wealth per adult, New Zealand was placed fourth after Switzerland, Australia, and Belgium.
"In contrast, the United States falls dramatically from third place according to mean wealth to 23rd place according to median wealth," the report said.
The report found that to be in the wealthiest 10 per cent, a person needs US$71,600. Half of the world's adults own less than US$2,222, while those in the bottom 20 per cent own less than US$248. Economic inequality has increased this year, with the top percentile estimated to own 50.8 per cent of global household assets.
Earlier this month, New Zealand was placed at the top of the Legatum Prosperity Index because of its "unrivalled ability to turn its wealth into prosperity" - a broader measure than just money.
The world's wealthiest citizens
1. Switzerland (US$562,000 per adult)
2. Australia (US$376,000)
3. The United States (US$345,000)
4. Norway (US$312,000)
5. New Zealand US$299,000