This study proposes a conceptual model for examining factors affecting e-government adoption in developing countries. It includes evaluating the existing adoption model studies of e-government adoption. Preexisting theoretical model and comprehensive analysis of the various resources was chosen to guide this work, and the result revealed that additional external factors were also important for explaining the e-government adoption in developing countries. Hence, external factors such as trust, national culture, knowledge of e-government services and DeLone and McLean information system (D&M IS) success model also considered relevant were integrated with the unified theory of acceptance and use of technology (UTAUT) constructs as examining factors affecting egovernment adoption. Finally, this study finds a formulation of the conceptual model and their relationship with all variables for explaining e-government adoption through a systematic justification of the proposed integrated model.