Countries with legalized gambling offer a network of government funded face-to-face therapy, but usage of this expertise is on the decline. One way to address this issue is to recruit therapists from existing services whereby they provide guidance for the delivery of internet delivered CBT. To explore the experiences and perceptions of therapists supporting guided online cognitive–behavioural therapy. Interviewees were a sub-sample of therapists from a randomised trial that investigated the relative efficacy of online guided self-directed versus pure self-directed interventions in Australia. In-person, semi-structured interviews with seven service providers were completed, and thematic content analysis identified five themes which related to: participant suitability and screening (e.g., motivation, computer literacy and access); program content and modality acceptability (e.g., amount of content, look and feel); participant information and management (e.g., program engagement and progression); email communication (e.g., use of templates, appointments, rapport building), and; ongoing service integration (e.g., infrastructure, confidence in product). Overall experiences and perceptions of therapists were positive, notwithstanding barriers concerning assessment of participant suitability, participant management systems and low participant engagement. Key themes emphasized the benefits of Internet-based interventions for problem gambling, and suggested several areas for improvement. Results should inform the development of future treatments to enable flexible tailoring of interventions to individuals. •Guidance for iCBT can be integrated into routine service delivery.•Screening for suitable clients is important to guides.•Guidance as it is typically delivered may be constrictive for highly experienced clinicians.•Ongoing service integration was viewed positively in terms of developing a suite of services.