Pakistan is witnessing the largest population movement since its independence in 1947. Needs are enormous, as millions of people have fled without anything and sought shelter in camps or with relatives. Yet, the implications of this humanitarian crisis and growing instability have not been adequately recognized. U.S. and international funding is urgently required to support the UN and aid agencies who are struggling to respond to the most pressing needs and to prepare for future displacement. The UN must also take steps to ensure that no one is forced to return home and to reduce conflicts of interest by the Pakistani military as it leads the relief effort.