Introduction: Strength and Difficulties Questionnaire (SDQ) is an international screening tool widely used for research and clinical practice on child and adolescents. Objective: The aim of this study was to explore the relationship between SDQ indices and ‘Hyperactivity/Impulsivity’ and ‘inattention’ domains of specific ADHD scale. Method: The SDQ and ADHD-RS-IV were administered to parents and teachers of a sample of 212 children aged between 6 and 16 years old with a prior diagnosis of ADHD. Results: A significant relationship between ‘Hyperactivity/inattention’ Scale (SDQ) and ‘hyperactivity/impulsivity’ and ‘inattention’ ADHD dimensions was confirmed. However, other SDQ scales were also related, depending of informant and ADHD domain. For the family, ‘hyperactivity/impulsivity’ domain was related with high scores on ‘behavior problems’ scale, while the ‘inattention’ was related with ’emotional symptoms’ scale. Conclusions: This results suggest the possibility of to take into account rating scores on SDQ scales to increase the sensitivity of the scale to discriminate ADHD clinical subtype.