Relations between symptoms of attention-deficit/hyperactivity disorder (ADHD) and oppositional defiant disorder (ODD) and bullying-victimization in adolescence are not yet clear. Accordingly, the current study evaluated these associations, with attention to gender differences, in a sample of predominantly Latino 9th-12th grade students (52.6 % male; mean grade level = 10.35, SD = 1.11). Further, the role of peer delinquency in these associations was evaluated. Findings indicated that ODD symptoms were more strongly associated with both bullying and victimization than ADHD symptoms, and the effects of ODD symptoms on physical forms of both bullying and victimization were stronger for males than females. The association between ODD symptoms and physical bullying was stronger at high levels of peer delinquency when compared to low levels of peer delinquency for both males and females. The role of peer delinquency in the link between ADHD symptoms and bullying and victimization appears to be gender specific and in need of further evaluation. Implications for the need to focus primarily on ODD symptoms for both bullying and victimization prevention and intervention are discussed.