In this Handbook, an interdisciplinary range of scholars analyze the diversity among various groups of labor and refugee migrants, marriage and ethnic return migrants, and diasporas in various continents, including the Americas, Europe, Asia, and the Middle East. In addition to ethnic diversity, chapter authors discuss migrant differences based on gender and sexuality, social class, generation, and legality and how they impact host societies and their treatment of migrant groups. Comprehensive and thought-provoking, this Handbook is a vital read for students and scholars in migration studies, anthropology, sociology, and geography. Its conceptual framework about migration and diversity will also appeal to those studying race and ethnicity, diasporas, and gender.