There is vast empirical evidence showing that juvenile delinquency is associated with delays in moral development, including moral judgment, empathy, and self-conscious emotions (guilt and shame). Consequently, interventions have been developed that target moral development of juvenile delinquents to reduce criminal offense recidivism. However, a comprehensive synthesis of studies examining the effectiveness of these interventions was not yet available. The present meta-analysis of (quasi-)experimental research therefore examined the effects of interventions that target moral development of youth engaged in delinquent behavior. Interventions that targeted moral judgment (11 studies and 17 effect sizes) showed a significant and small-to-medium effect on moral judgment (