This article discusses the concept of justice from a social psychological perspective. The authors begin by briefly outlining some theoretical precursors of current social psychological research on justice. Another part is devoted to an overview of theories and empirical research in the areas of distributive and procedural justice. The article furthermore addresses interactional justice, why people care about justice, and reactions to injustice in the context of which individual differences in conceptions of justice are briefly discussed. The article ends by discussing some current trends, social applications, and some future challenges in social psychological inquiries of social justice.