Achieving the successful delivery of digital transformation projects and programmes has become a critical agenda for most government organisations. Explicit evidence can be found in an increasing number of publications including academic research, government policy documents and industry reports. Despite such academic and practical achievements in the private sector, there has still been a lack of theoretical foundation with respect to the concept and context of digital government, the digital transformation of government. To avoid theoretical fragmentation in the digital government field, this study aims to have a better understanding of the process of digital government. Systematic literature review is carried out to identify the commonalities and disparities of digital government in the public and private sectors by investigating academic and non-academic sources. The results will contribute to our theoretical understanding of digital government for bridging research and practice.