Purpose: The purpose of this paper is to extend and validate the unified theory of acceptance and use of technology (UTAUT) for investigating the effect of transparency on the adoption of e-Government in Indonesia from the perspective of citizens. Design/methodology/approach: A comprehensive review of the related literature leads to the development of a transparency-focused conceptual model to better understanding the adoption of e-Government. Structural equation modelling is used for analysing the data collected from the citizens in Indonesia. Findings: This study confirms that performance expectancy, effort expectancy, social influence, facilitating conditions and transparency are the critical factors for evaluating the citizen adoption of e-Government in Indonesia. In addition, transparency is found to be the strongest factor that influences the decision of Indonesian citizens to adopt e-Government. Research limitations/implications: From the theoretical perspective, the use of the UTAUT model is extended by incorporating the transparency factor that is vital to the adoption of e-Government in developing countries such as Indonesia. Practical implications: In terms of managerial and policy implications, this research offers the Indonesian Government suggestions on how the adoption of e-Government can be improved. Originality/value: This is the first study that extends and empirically validates the UTAUT model with transparency for evaluating the adoption of e-Government from the perspective of citizens in Indonesia. It demonstrates how the transparency factor can be incorporated to better understand the adoption of e-Government in such a context.