This paper represents the first systematic attempt at an analysis of religious nongovernmental organizations (RNGOs). Largely ignored as an organizational field, RNGOs constitute a new breed of religious actors shaping global policy–an organizational hybrid of religious beliefs and social activism at local, national, and international levels. This paper proposes a definition of RNGOs, traces the emergence of RNGOs from an historical perspective, and situates them in their current religious and sociopolitical contexts. Drawing on interviews and documentary data from a sample of 263 United Nations-affiliated RNGOs, the author proposes an analytical framework to examine the religious, organizational, strategic, and service dimensions of these organizations. Religious nongovernmental organizations' unique contributions to the redefinition of a just society as well as the sociopolitical challenges arising from their religious identity are discussed.