Political parties can be key actors in the prevention and disruption of democratic erosion. Scholars have documented strategies political parties can implement to slow or reverse erosion. However, there is a dearth of guidance on which strategies are most effective, and the variation from one operating environment to another can undermine the application of this research in democracy and governance (DG) programming. To address this gap, the International Republican Institute (IRI) completed a literature review to investigate patterns of democratic erosion, the strategies political parties have used to oppose democratic erosion, and the factors that affect parties’ opportunities to implement these strategies.