ABSTRACT Green purchasing is recognized as an essential aspect and a key driving force of green supply chain management. Prior studies mainly focus on identifying drivers and barriers of organizational green purchasing adoption. However, the list of drivers and barriers does not provide a model capable of explaining the decision and behavior of adopting green purchasing by organizations. Therefore, this research attempts to develop a theoretical model on organizational green purchasing adoption. Specifically, our development of the theoretical model is built on the Diffusion of Innovation Theory and the Technology, Organization, and Environment (TOE) framework. Finally, we conduct a case study on a European based electronic leading company to illustrate our proposed theoretical model.