The goal of this study was to test nonverbal intelligence and neighborhood social capital as protective factors against future delinquency in early adolescent youth placed at risk by virtue of their involvement in childhood conduct problems. Analyzing longitudinal data from 3,028 youth (1,565 boys, 1,463 girls) in one cohort of the Longitudinal Study of Australian Children (LSAC) and 3,682 youth (1,896 boys, 1,786 girls) in a second cohort of the LSAC, nonverbal intelligence, as measured by the Matrix Reasoning subscale of the WISC-IV, displayed a consistent moderating effect on the conduct problems--future delinquency relationship. According to these results, conduct problems were slightly but significantly less likely to lead to delinquency when nonverbal intelligence was high than when it was low or moderate. By shielding at-risk children from future delinquency, protective factors like high nonverbal intelligence may provide a means by which delinquency can be prevented or reduced.