The group said Syria and Jordan need direct assistance in order to provide housing, food aid, and health care to some 2 million refugees.
Nearly 2 million more Iraqis are displaced within their home country, the report said.
The appeal came a day before the start of an international conference in Geneva on Iraqi refugees.
Iraq's Refugee Crisis
Children at an Iraqi camp for displaced people outside Al-Nasiriyah in May 2006
REFUGEES FLEE SECTARIAN VIOLENCE The UN High Commissioner for Refugees has estimated that over 2 million Iraqis have fled sectarian violence for Jordan, Syria and other neighboring states, while an equal number may be internally displaced within Iraq..... (more)