Mentoring is an important learning experience for adults. The current chapter provides an overview of learning in academic and workplace mentoring, including an original review of published research on the topic. A total of 48 studies were identified that examined learning in mentoring relationships from the perspective of the protégé and/or the mentor. This literature is reviewed and a narrative summary of the findings are provided. Building on this narrative review, and integrating various established theories of learning and development, we then propose an integrative framework which depicts how, why, and under what conditions mentoring relates to learning. We close by offering and agenda for future research on learning in mentoring to guide future scholarship on learning in mentoring relationships.