Research suggests that the causal attributions utilized by children with attentiondeficit/ hyperactivity disorder (ADHD) differ from those of nonclinical children. Additionally, research indicates differences among the mothers of children with and without ADHD regarding parenting behaviors and attributions for child behavior. In this study, children' s attributions , maternal attributions , and maternal discipline styles were examined in ADHD and non-ADHD populations Participants included 26 children diagnosed with ADHD and their mothers as well as a nonclinical sample of 24 children who had never been diagnosed with ADHD and their mothers. The results support the hypotheses that child and maternal attributions would differ between these two groups. The hypothesis that discipline styles would differ between the two groups was not supported Results suggest that while maternal discipline styles are correlated with children's attributions, the nature of this association differs within AD.HD versus nonADHD populations.