This chapter provides an overview of concepts within the field of closed loop supply chain management. First, using some qualitative frameworks we categorize and characterize the many different closed loop supply chains that are found in practice. Then, we identify key processes and potential bottlenecks that need to be addressed for efficient and effective management. Several modeling approaches are presented, moving from very basic via more advanced to state-of-the-art models that make complex trade-offs and generate more refined insights. The mathematical models presented are meant as simple illustrations of broader concepts. Hence, this chapter is certainly not meant as a comprehensive review of the logistics and operations management literature within the field. Rather, we hope that it can inspire newcomers to the field and specialists who would like to broaden their view.