Book excerpt: Currently, there are several divergent and convergent understandings of diversity, equity, and inclusion (DEI) as the term continues to evolve and expand. A number of scholars, practitioners, and international bodies have attempted to define the concept, theoretical underpinnings, dimensions, and sources of DEI as well as its advantages and disadvantages in organizations and workplaces. However, further study is necessary to accurately define the concept of DEI in order to appropriately develop and implement inclusive policies in today’s business world. Mainstreaming Diversity, Equity, and Inclusion as Future Workplace Ethics enhances the historical origin of DEI, considers existing definitions and theories of DEI from a multidisciplinary lens, and provides insightful and valuable materials that are focused on DEI to aid the application of these concepts in theory and practice. Covering topics such as economic growth and policy development, this reference work is ideal for policymakers, ethicists, human resource specialists, business owners, executives, managers, industry professionals, academicians, researchers, instructors, and students.