The purpose of this research was to investigate the possibility that there are sex differences between ADD-H boys and girls. ADD-H boys and girls were compared on the four variables of presenting problem, referral source, intelligence test performance on the Wechsler Intelligence Scale for Children-Revised (WISC-R) and WISC-R subtest configuration. General demographics of the ADD-H boys and girls families were also examined. The subjects participating in this study were 39 girls and 41 boys from a large child outpatient facility in the Dallas/Fort Worth metroplex diagnosed as ADD-H between February 1984 and February 1986. No differences were found when comparing ADD-H boys and girls on all four variables. These results may suggest that there are no real differences in regards to presenting problem, referral source, IQ scores and subtest configuration between boys and girls diagnosed ADD-H.