The meeting was requested by France which expressed concern over the advance of Islamic State fighters and the seizure of Qaraqosh, in a new offensive that has driven tens of thousands of people from their homes.
The talks are scheduled to begin at 5:30 pm (local time), a diplomatic source said.
"France is very deeply concerned by the latest advances of (IS militants) in the north of Iraq and the taking of Qaraqosh, the biggest Christian city in Iraq, as well as by the intolerable abuses that were committed," French Foreign Minister Laurent Fabius said in a statement.
The latest advance saw the Sunni extremist Islamic State extend its writ over northern Iraq and move within striking distance of autonomous Kurdistan.
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IS, which proclaimed a "caliphate" straddling Syria and Iraq in late June, moved into Qaraqosh and other towns overnight after the withdrawal of Kurdish peshmerga troops, residents said.
Joining world alarm over the IS advance, Pope Francis called on the international community to protect the mostly Christian communities of northern Iraq fleeing a lightning advance by jihadist militants.
The UN council on Tuesday condemned attacks by IS fighters in Iraq and warned that those responsible for the violence could face trial for crimes against humanity.