Libya conflict: Leaders gather for Paris summit
US Secretary of State Hillary Clinton will attend, as will China and Russia, which has now recognised the National Transitional Council (NTC) as Libya's legitimate government.
The NTC will call for help on security, rebuilding and preparing for democracy.
But it has still not captured Col Muammar Gaddafi, whose son Saif al-Islam again vowed a fight to the death.
The BBC's Jon Leyne, in Benghazi, says although the Paris meeting will be short and symbolic, it will give the governments who have supported the NTC another chance to show it has a place on the world stage.
He says the meeting will hone plans for the transition to democracy, for reconstruction and issues such as enhancing the training of police.
The NTC, our correspondent says, will press for a further unfreezing of assets but will also stress that it does not want any lessening of Nato support as it tries to quell the remaining loyalist pockets.
About 60 countries are to attend the "Friends of Libya" forum in Paris on Thursday afternoon, along with UN Secretary-General Ban Ki-moon.
The meeting comes on the 42nd anniversary of Col Gaddafi's emergence as the leader of the coup that overthrew King Idris.
It will hear a report from the NTC on security, governance, reconstruction and the economy.
The most urgent need is the restoration of services such as fuel, electricity and water in key cities, along with food supplies and the payment of workers.
The US has said the credibility of the NTC will initially rest on addressing such issues.
On Wednesday, £140m in Libyan banknotes (280m Libyan dinars) was flown by the British air force to the country, the first tranche of £950m that will be handed to Libya's Central Bank.
And on Thursday, France announced it had now received approval to release 1.5bn euros ($2.16bn) of Libyan assets to the NTC.
The NTC received a further diplomatic boost on Thursday when Russia formally recognised its authority; Kazinform refers to BBC.
To learn more go to www.bbc.co.uk