This study was designed to see the relationship between the modes of acculturation and delinquent behavior among Korean American youths in the United States. A self‐reported survey was administered to a total of 400 elementary to high school students with Korean ethnicity at 20 randomly drawn Korean churches nationwide. A total of 129 questionnaires were returned and subjected for further statistical analysis. A cluster analysis suggested three modes of acculturation; separation, assimilation, and marginalization. Although the results of ANOVA between delinquent behavior and acculturation modes indicated the absence of any statistically significant difference, Duncan test showed that the assimilated was most likely while the marginalized was least likely to engage in delinquency. Among five mediating factors, only delinquent friend was significantly correlated with delinquency for the separated mode while delinquent friend, attachment to parents, and educational aspiration correlated with the assimilated mode. Both attitudes toward law violation and perceived racial discrimination were significantly correlated with delinquency for the marginalized mode.