This document provides a literature review on the topics of crowdsourcing and the circular economy. It begins with background information on the circular economy, including its principles and potential benefits over the traditional linear economy model. Some challenges to adopting circular economy approaches are also discussed. The document then explores the concepts of innovation and crowdsourcing, how they relate to open innovation, and their potential to generate new product ideas for the circular economy. While no existing studies were found that directly link crowdsourcing with circular economy goals, the document argues they warrant further investigation as a way for companies to explore circular economy principles with less risk.