Officials from 18 countries are expected to attend, as are representatives of international organizations.
The meeting comes at a time when the country is plagued by a resurgent Taliban guerrilla resistance and soaring opium output.
Organizers say the talks are to focus on ways the international community and the United Nations can help the Afghan government tackle issues of security, good governance, regional cooperation, and drug trafficking.
The meeting is co-hosted by UN Secretary-General Ban Ki-moon and Afghan President Hamid Karzai, who is due to address the UN General Assembly on September 24.
Joining them at the talks are representatives from the UN Security Council's five permanent member-- Britain, China, France, Russia, and the United States -- as well as Canada, Germany, India, Iran, Italy, Japan, Netherlands, Norway, Pakistan, Saudi Arabia, Spain, and Turkey.
Also invited are the Asian Development Bank, the European Union, the European Commission, NATO, and the World Bank.
Development Blueprint
Participants will review progress toward implementing the Afghanistan Compact, a five-year development blueprint launched in January 2006 by Kabul and some 70 foreign partners.
Under the deal, Afghanistan promised to take specific steps in the areas of security, governance, rule of law and human rights, and economic and social development in return for military and economic support.
Afghan Foreign Ministry spokesman Sultan Ahmad Beheen told RFE/RL's Radio Free Afghanistan in New York today that discussions on peace negotiations between the Afghan government and the Taliban are not on the agenda.