BACKGROUND/OBJECTIVE: Behavioural Parent Training (BPT) is an evidence-based psychosocial intervention for attention-deficit/hyperactivity disorder (ADHD) in children. The use of online technologies significantly increases the accessibility of these interventions. This study aimed to assess the relative efficacy of face-to-face and online training in the use of parenting strategies taught. We also explored the impact of parental ADHD symptom levels.