There is growing recognition of the importance of addressing the mental health needs of young people attending university. Anonymous, scalable, and evidence-based online interventions can help to reduce burden on university services and increase access to care for marginalised or disconnected students. This paper reports the participatory design methods used to develop the Uni Virtual Clinic (UVC), a comprehensive online programme that was designed to prevent and treat mental health problems and related issues in university students. Data evaluating the participatory design process is also presented. The potential for the implementation of the UVC within university-based counselling services is strong, and has potential to reduce the prevalence of mental disorders in a high-risk group of young people.