Definition
Labelling theory argues that what makes an act deviant is not the act itself but the social reaction to it. The same behaviour can pass as normal in one setting and trigger sanction in another; deviance is therefore produced through the process of naming, recording, and treating someone as a rule-breaker.
The position is associated with Edwin Lemert, who distinguished primary from secondary deviance, and with Howard Becker, whose 1963 book Outsiders argued that deviance is created by the groups whose rules are broken. Erving Goffman's work on stigma supplied the social-psychological mechanism: once labelled, a person renegotiates identity around the spoiled status.
Why it matters
How it works
The mechanism runs in two stages. In the first, a person commits an act that may go unnoticed or be excused. In the second, an agent of social control — police, teacher, magistrate, neighbour — applies a public label, the labelled person internalises it, and others reorganise their expectations around the new identity. Future opportunities narrow, deviant networks become more accessible, and the original act hardens into a career.
The framework reorients research toward the politics of definition: who has the power to label, which groups are over-represented among the labelled, and how administrative categories shape lives. Critics charge that the theory underplays the harm of the original act and the agency of repeat offenders, but its core insight — that reaction matters as much as conduct — remains foundational for studies of stigma, diversion, and restorative justice.