Research indicates that children with autism spectrum disorder (ASD) frequently exhibit dysregulation, which refers to poorly coordinated affective, behavioral, and cognitive responses to a given situation. We examined the characteristics of dysregulation in children presenting to a multidisciplinary ASD clinic for an ASD diagnostic evaluation. Sixty percent of children presenting for an ASD evaluation exhibited dysregulation. Dysregulation prevalence was higher in children without ASD versus with ASD (69% versus 56%). Severe dysregulation was higher in children without ASD (29% versus 16%). Both groups with severe dysregulation were equally likely to be taking psychiatric medications, however, children with ASD were less likely to be receiving therapy. These findings highlight the importance of implementing dysregulation screening and treatment protocols in ASD centers.