"If you want to become a full global player, it comes with responsibilities," said Salil Shetty, director of the UN’s Millennium Campaign, which aims to halve extreme poverty and boost life expectancy by 2015.
"If Gulf states are serious, let us have some cash down," Shetty said in an interview on the sidelines of a UN aid meeting in Qatar’s capital.
Gulf states, along with developing countries, have demanded a bigger role in global financial institutions such as the IMF and World Bank as the financial crisis ripples through their economies.
"They are doing more in terms of helping Islamic countries, which is a good starting point," Shetty said.
"There is no reason why the US can support Israel in that [aid] sense, and Gulf countries cannot support Muslim countries.
"I think they need to step up a lot more than they have and they need to become part of the global process because right now they are kind of isolated. They are not part of the mainstream discourse and they need to get there," he said.
European and US leaders and officials have visited the region in recent weeks, seeking more funds for the IMF as it organises bailouts for stricken countries.
Gulf states maintain that any cheques would come with conditions.
Shetty said it was unclear how much Gulf states gave in development aid because they were not part of the OECD’s Development Assistance Committee (DAC) which tracks statistics on aid based on data provided by its members.
"We do not get clear numbers, it is very opaque. There needs to be more transparency, with these sovereign funds which are massive," he said. The UN official’s remarks came after Qatar’s ruler said on Saturday that too much was expected of oil producers.
"Sometimes we have a feeling that there are some attempts to put the whole burden of development on the oil-producing countries and in this logic we see some prejudice and disavowal," Sheikh Hamad bin Khalifa Al Thani said.
The UN summit on financing for development, which runs until Tuesday, has been overshadowed by the global financial crisis.
