Nauru and Australia are expected to discuss progress on the United States refugee resettlement deal signed between Canberra and Washington.
According to the deal reached last year, some of Australia's refugees held on Nauru and in Papua New Guinea would be settled in the US while Australia is supposed to take refugees from Central America.
Today's talks in Sydney will be between Nauru's President, Baron Waqa, and the Australian prime minister, Malcolm Turnbull.
Mr Waqa is also due to meet Australia's foreign minister Julie Bishop, officials from the Asian Development Bank, opposition MPs and the Australian Governor-General Sir Peter Cosgrove.