Scholars use the theoretical lens of bias to research various behavioral phenomena in entrepreneurship. We assess this body of research, focusing on definitional issues and relationships. Furthermore, we discuss how the study of bias in entrepreneurship can be advanced, given the new development in related fields such as cognitive sciences. The assessments and discussions help reveal as well as address tensions in the literature, identify numerous research opportunities that may not be obvious by looking at previous work individually, and contribute to how the theory of bias can further help to understand entrepreneurship.