Background: With most mental health problems established during childhood/adolescence, young people must be a key focus of public mental health approaches. Despite the range of factors known to influence mental health, evidence for effective interventions is lacking for this age group. This study aimed to define priorities for future public health intervention-focussed research to support youth mental health by engaging with transdisciplinary stakeholder groups.

Methods: Our co-production approach involved priority-setting workshops with young people, researchers, practitioners and policymakers. Each workshop focussed on three thematic areas: social connections and relationships; schools and other education settings; and key groups at greater risk of mental ill-health, specifically LGBTQ+ and care-experienced young people. Workshop outputs were synthesised to define research priorities.

Results: This paper presents the research priorities that were defined through the priority-setting workshops, and our reflections on the co-production approach to guide future similar activities undertaken by others. Ten priorities for youth public mental health research were defined, covering the following areas: building supportive relationships; whole system approaches; social media; support at times of transition; improving links between different services; development and training for those who support young people; staff mental health; engaging with families; awareness of and access to services; and out of school and community settings.

Conclusions: These research priorities can inform future intervention development to support youth public mental health. Our transdisciplinary approach means the identified research priorities are likely to be relevant to young people’s experiences and needs, and to fit with the needs of those working in practice and policy to support young people.