Hacktivists oftentimes challenge or subvert existing power relations or structures and attempt to promote reform. How the public perceives occurrences of hacktivism can influence the direction and impact of operations, including their potential success. Public support can encompass person power, computational ability, resources and solidarity, among other things. This study examines socio-legal contexts in which an individual is embedded and personal perceptions as predictors for support for hacktivism. Using representative survey data from 23 countries ( n = 23,140), the study finds that more effective civic participation mechanisms and more positive views toward alternative actors and hacktivists’ utilitarianism motives were associated with heightened support. In contrast, greater trust in legal and state authorities promoted opposition. Effective justice was not associated with more support but was with less opposition for hacktivism. Implications for campaigns, social movements, and desistance of activity are discussed.