This Handbook deals with theoretical and empirical evidence on the economics of discrimination and affirmative action across the world, assessed over a variety of social identities, such as caste, race, ethnicity, gender, disability, age, tribal status. It also outlines methodological advances in this area, with plenty of additional references for the interested reader. It combines theoretical frameworks developed in the West with historical writings about discrimination and social justice from primarily Indian philosophers, aspects which are typically not found under one roof. It offers the reader a combination of insights into theories across a range of disciplines, as well as evidence, data -both quantitative and qualitative, in addition to the latest methodological advances in the estimation of discrimination - econometric, experimental, mixed-methods.