E-government is becoming a mature research field thanks to the proliferation of papers about this changing paradigm. Among this research, the participation of citizens in e-government is a topic that has particularly stimulated numerous discussions. This participation (referred to as “e-participation”) is often reduced to the democratic participation of citizens in decision-making and policy design (or “e-democracy”). However, this paper aims at reexamining the scope of e-participation by considering the under-investigated field of citizen participation in e-government service delivery. This participation can take place as the co-design and co-execution of these services. In order to examine the existing body of knowledge of the field, we conduct a Systematic Literature Review followed by a template analysis of the selected papers. This analysis allows us determining avenues for further research in this area about the following research themes: stakeholders involved, organizational and motivational pre-conditions, participation methods and outcomes of participation