Citizen engagement in political discourse and in democratic decision-making via innovative online means (coined e-participation) has become subject of considerable research over the past decade. However, mass engagement of citizens in online consultation and decision-making contexts remains an unsatisfied expectation. In this paper, we investigate trust as a particular aspect that might influence whether a citizen will participate. Trust is perceived as a complex construct, which is subject of research in distinct research disciplines. To identify and implement measures for increasing trust as well as for minimising distrust in e-participation endeavours, relevant trust relationships have to be analysed to understand implications of using or not using e-participation offers. In this paper, the status of current research of trust in citizen participation supported by electronic means is investigated. The literature review unveils that various implications of trust in the context of e-participation are still not researched well. Existing studies investigate particular aspects of trust. Yet, no conceptualisation of a trust model is available that explains the full scope of trust in e participation contexts. Hence this paper puts forward such a trust model for e participation, which builds on the Integrative Model of Trust in Organisational Settings by Mayer, Davis and Schoorman (1995) and the Interdisciplinary Model of Trust Constructs by McKnight and Chervany (2001).