In the era of globalization the well-being of each nation depends on joint actions of all states taken through international cooperation in creation of favorable conditions for progressive global development. Right to development, which obliges international community to enable states to ensure development, to eliminate obstacles to development and to implement all human rights into the development process by the means of international cooperation, can become a basis for progressive global development. As right to development is not legally enforceable yet (except for states-parties to African Charter on Human and Peoples’ Rights), states` duty to cooperate in development derives from UN Charter, International Covenant on Economic, Social and Cultural Rights, Convention on the Rights of the Child, Convention on the Rights of Persons with Disabilities and international customary law. This monograph provides an analysis of the provisions of these international legal instruments in respect to duty of international cooperation in development. It would be especially useful to international lawyers, development scholars and practitioners.