Objective. The goal of the current study was to examine the impact of maternal attention-deficit hyperactivity disorder and oppositional defiant disorder symptoms on several dimensions of parenting. Design. One-hundred seven mothers of young adolescents provided ratings of their own attention-deficit hyperactivity disorder, oppositional defiant disorder, depressive symptoms, and parenting behavior, as well as their adolescents’ aggressive behaviors. Results. Hierarchical regression analyses examined the relative contributions of attention-deficit hyperactivity disorder and oppositional defiant disorder symptoms to parenting. Greater levels of maternal attention-deficit hyperactivity disorder symptomatology were associated with poorer monitoring, whereas more oppositional defiant disorder symptoms were associated with lower levels of parenting involvement and positive reinforcement and higher levels of overreactivity and use of corporal punishment. Conclusions. Maternal oppositional defiant disorder behaviors were particularly associated with negative, affective dimensions of parenting. Understanding the impact of maternal attention-deficit hyperactivity disorder symptoms on parenting may require consideration of concomitant maternal oppositional defiant disorder symptoms.