Background and objectives: Functional disturbances developed early in life include balance deficits which are linked to dysfunctions of higher levels of cognitive and motor integration. According to our knowledge, there are only a few studies suggesting that balance deficits are related to behavioral disturbances in attention-deficit/hyperactivity disorder (ADHD). Methods: We tested the extent to which balance deficits were related to ADHD symptoms in 35 medication-nave boys of school age (8-11 years) and compared the results with a control group of 30 boys of the same age. Results: ADHD symptoms in medication-naive boys had specific relationships to disturbances of postural and gait balance. Conclusion: To our knowledge, this study provides the first evidence in the medical literature for a direct relationship between ADHD symptoms and balance deficits, that cannot be attributed to medication and the presence of any neurological disease.