Objective:More knowledge on the impact of classroom setting on behavior of children with ADHD may help us to better adjust classroom settings to the needs of this group.Method:We observed ADHD behaviors of 55 children with ADHD and 34 typically developing peers (6–12 years) during classroom transitions, group lessons, and individual seatwork.Results:Multivariate analyses revealed that levels of motor and verbal hyperactivity increased during classroom transitions compared to group lessons and individual seatwork. Children in the ADHD group were more off-task, across settings. There were no interactions between group and setting.Conclusions:Children with ADHD were similarly affected by classroom setting compared to typically developing peers, despite being more off-task across settings. Further research into whether the observed increase in hyperactivity during classroom transitions may be problematic or possibly even beneficial for children with ADHD is recommended.