Qualitative meta-synthesis (QMS) is a method that is used to explain the findings of a group of qualitative studies on a similar subject. QMS can be explained as a qualitative counterpart to quantitative meta-analysis or as a methodological development from critical literature reviews and secondary analysis. The following four elements constitute any QMS: conceiving the synthesis, retrieving and appraising sample studies, extracting themes in and between studies, and synthesizing the findings. This chapter describes these four procedural steps. The intention is that they should serve as stimulus to creativity rather than to prescriptive procedures. QMS can contribute to reducing the divide between the qualitative and quantitative research in criminology by managing information from qualitative studies, addressing knowledge fragmentation, and encouraging dialogue. By interpreting qualitative findings across studies and raising the level of abstraction, QMS increases their relevance to the benefit of criminology and criminal justice research as a whole.