Background: GPs, as healthcare professionals with whom young people commonly interact, have a central role in early intervention for mental health problems. However, successfully fulfilling this role is a challenge, and this is especially in deprived urban areas.

Aims: To inform a complex intervention to support GPs in this important role, we aim to identify the key areas in which general practice can help address youth mental health and strategies to enhance implementation.

Methods: We conducted a modified Delphi study which involved establishing an expert panel involving key stakeholders/service providers at two deprived urban areas. The group reviewed emerging literature on the topic at a series of meetings and consensus was facilitated by iterative surveys.

Results: We identified 20 individual roles in which GPs could help address youth mental health, across five domains: (1) prevention, health promotion and access, (2) assessment and identification, (3) treatment strategies, (4) interaction with other agencies/referral, and (5) ongoing support. With regard to strategies to enhance implementation, we identified a further 19 interventions, across five domains: (1) training, (2) consultation improvements, (3) service-level changes, (4) collaboration, and (5) healthcare-system changes.

Conclusions: GPs have a key role in addressing youth mental health and this study highlights the key domains of this role and the key components of a complex intervention to support this role.