This paper consists of two parts. The first part analyses the involvement of non-state actors in the United Nations (UN) and its agencies. The engagement of non-state actors, particularly of the international non- governmental organizations (I-NGOs) and the various national civil society organizations (CSOs) dates back to the founding of the United Nations in 1945 and the analyses show a growing participation of NGOs from developed and developing countries. The second part describes the role and participation of the I-NGOs in the deliberations and negotiations on global public policymaking and standard setting negotiations of aid effectiveness.