The purpose of this study is to evaluate the feasibility and effectiveness of Internet-delivered Cognitive Behavior Therapy (ICBT) for children (7-11 years) with Obsessive-Compulsive Disorder (OCD).

The primary objective of this study is to investigate if Internet-delivered Cognitive Behavior Therapy (ICBT) is a feasible and effective treatment for children (7-11 years) with Obsessive-Compulsive Disorder (OCD). The design of the study is a pilot study with 16 participants. The treatment duration is 12 weeks. The primary outcome measure is the Children's Yale-Brown Obsessive Compulsive Scale (CY-BOCS). Study participants will be followed up 3 months after treatment.

Inclusion Criteria:

• Primary DSM-5 diagnosis of OCD
• Total score of ≥16 on the Children's Yale-Brown Obsessive-Compulsive Scale (CY-BOCS)
• Age between 7-11 years
• Ability to understand Swedish
• Daily access to the Internet
• A parent that can co-participate in the treatment
• Participants on psychotropic medication must had been on a stable dose for the last 6 weeks prior to baseline assessment

Exclusion Criteria:

• Diagnosed autism spectrum disorder, psychosis, bipolar disorder, severe eating disorder, organic brain disorder, learning disability
• Suicidal ideation
• Not able to understand the basics of the ICBT self-help material
• Have completed a course of CBT for OCD within last 12 months (defined as at least 5 sessions CBT including exposure and response prevention)
• On-going psychological treatment for OCD or another anxiety disorder