BAGHDAD — The United Nations said Wednesday it would present a list of proposals to resolve the conflict over the oil-rich city of Kirkuk and other disputed regions in northern Iraq.

Staffan de Mistura, the United Nation’s special representative for Iraq, said that its Assistance Mission for Iraq would present proposals by the end of October. The objective, he said, was “a grand deal” among the Sunni Arabs, Shiite Arabs, Kurds, Turkmens, Yazidis, and other groups now passionately pressing their claims in the area. The proposals will reflect months of research by a diverse team of 15 lawyers, negotiators, academics, diplomats and historians, some with experience in Bosnia, Israel and the Palestinian territories. They will center on Kirkuk, “the hottest issue in Iraq these days,” de Mistura said.