Understanding the dynamics of nonviolent action in situations of armed conflict has been labelled as the 'new frontier' in resistance studies. This paper assesses the growing body of literature on civilian resistance against rebel groups. Drawn from a systematic review of academic articles, book chapters, and policy documents, examples of civilian resistance are ordered in three distinct categories of unarmed action: deception; dissent; and defiance. This classification provides the conceptual framework to tackle the main research question: does civilian resistance against rebels work to protect unarmed populations from violence and harm? By scrutinising the effectiveness of civilian resistance, the paper seeks to provide a necessary corrective to the dominant view expressed in the literature, which, as argued, is overly optimistic regarding the prospects of wringing substantial concessions from armed groups via nonviolent action. The paper concludes with a discussion of policy implications, focusing on normative challenges facing external actors eager to support civilian resisters.