Examined the concurrent validity of the attention-deficit/hyperactivity disorder (ADHD) module of the Anxiety Disorders Interview Schedule for DSM-IV, Child and Parent versions (ADIS-C/P). One hundred eighty-four clinic-referred children were categorized into three ADIS-generated groups: No diagnosis of ADHD (No ADHD; n = 63), parent-only diagnosis of ADHD (Parent Only; n = 81), and parent plus child diagnosis of ADHD (Parent + Child; n = 40). The groups were compared on demographics, comorbid diagnoses, parent and child-report measures, and a computerized test of attention. Results support the concurrent validity of the ADIS ADHD module and highlight the positive relationship between internalizing symptomatology and parent-child agreement on ADHD diagnoses. The clinical implication of this study is that parent-child agreement on ADHD may serve as a marker of internalizing symptomatology. Future research on child self-perceptions is suggested in developing treatments for this internalizing ADHD group.