Gambling disorder (GD) has become a wide concern in Indonesia, as many negative consequences aroused from this psychiatric condition. Prompt treatment with appropriate method of delivery is required to achieve optimal outcome in GD patients. This study aims to determine the effectiveness and feasibility of internet-based cognitive behavioral therapy (iCBT) in treating GD.

This non-randomised pilot and feasibility study will recruit 20 people with GD. All participants will receive the iCBT intervention through self-learning videos and guided weekly group sessions. The effectiveness of the intervention will be assessed at baseline (week 0), post-treatment completion (week 10), and 6 weeks post-treatment (week 16).

Expanded access of the iCBT module will not be available until after the study completion.

Inclusion Criteria:

• be aged 18-59 years old;
• be screened as probable pathological gambler based on South Oaks Gambling Screen (SOGS);
• have access to electronic devices (ie, smartphone, mobile tablet, personal computer) with internet connection;
• be proficient in Indonesian language;
• have agreed to take part in the study by filling out the informed consent form.

Exclusion Criteria:

• have severe mental disorders or intellectual disabilities;
• have extreme agitation that hinder instrument fill out and adequate cognitive behavior therapy participation.