ABSTRACT: The purpose of this research is to explore parental criminality and its influences on male juvenile delinquency. This research examines the initial relationship between parental criminality and juvenile delinquency, which is consistent with biological theory, then further explores this relationship by controlling for factors from other theoretical perspectives that seek to explain juvenile delinquency. The factors examined in this study are intelligence, attachment to parents, delinquent associations, negative labels, and poverty. A longitudinal data set, the Cambridge Study in Delinquent Development, is utilized to empirically examine these issues. Both official and self-report data are examined. The present study finds that official delinquency is related to factors other than parental criminality. Parental approval of the boy and having delinquent older siblings also impact the juvenile's official delinquency. The number of delinquent acts committed by friends and the housing the juvenile lives in influences self-report delinquency. The strongest impact on self-report delinquency is delinquent associations. Therefore, parental criminality significantly impacts official delinquency but is not related to self-report delinquency.