In making sense out of interactions within or among groups in organizations or pertaining to social policies, individuals often ask: are they fair? Social psychological approaches to justice address how people answer this overarching question. We review conceptualizations of different types of justice, beginning with their philosophical roots. We then detail the micro-level theoretical foundations and empirical work addressing perceptions of distributive, procedural, and interactional justice and responses to injustice. We note social psychological work that has facilitated movement toward interrogating justice concerns at the meso-level of dynamics between groups and the macro-level of aspects of stratification and culture. We conclude by illustrating how social discrimination operates at each level of justice analysis and offer potential pathways for studying justice in areas such as health, education, and the environment.