Inclusion Criteria:  13 to 17 years of age A primary diagnosis of OCD according to Schedule for Affective Disorders and Schizophrenia for School-Age Children - Present and Lifetime version for DSM-IV (K-SADS-PL). Children's Yale-Brown Obsessive Compulsive Scale (CY-BOCS)24 total score ≥ 16.  Exclusion Criteria:  meet the criteria for an intellectual disability (IQ < 70), meet the criteria for psychotic disorder according to DSM-5, meet the criteria for Asperger's, or Autistic syndrome with a Clinical Global Impression Scale - Severity (CGI-S) rating ≥ 4 or same or higher rating than CGI-S for OCD meet the criteria for PDD-NOS with a Clinical Global Impression Scale - Severity (CGI-S) rating ≥ 4 or same or higher rating than CGI-S for OCD meet the criteria for any co-occurring mental disorder according to the Diagnostic and statistical manual of mental disorders (DSM-5) with a CGI-S rating higher than CGI-S for OCD, indicating that OCD is not the primary treatment priority have been treated with CBT six months prior to inclusion, have been treated with (S)SRIs six months prior to inclusion (dose ≥50 mg), have inadequate Danish language proficiency or both parents have inadequate Danish language proficiency