Suicide is a major public health concern among youth in Canada and worldwide. The most rapid increases in suicidal ideation, self-harm, and suicide attempts have been observed among adolescent girls, particularly since the COVID-19 pandemic. Recent studies report disproportionately high rates of emergency department visits and hospitalisations for suicide-related concerns among adolescent girls. Despite these concerning trends, limited evidence exists on the life trajectories, needs, and service pathways of adolescent girls who attempt suicide. This protocol describes a qualitative suicide audit focused on adolescent girls aged 12–17 who were hospitalised following a suicide attempt in two regions of the province of Québec, Canada. The aim is to understand developmental trajectories, document services received and identify individual, relational and systemic factors influencing these trajectories to generate recommendations that inform suicide prevention.

Using a narrative qualitative design and a community-based research approach, data will be collected from semi-structured interviews with adolescents and parents, parent questionnaires and hospital health records. These data will be integrated to develop anonymised case vignettes. A multidisciplinary panel, including clinicians, health system stakeholders, community partners and individuals with lived experience, will review each case to identify gaps and strengths in care and generate case-level and cross-case recommendations for clinical practice, health policy and professional training.

Ethics approval was obtained from the research ethics committee (REC) of the Centre intégré de santé et de services sociaux de Chaudière-Appalaches, which serves as the reviewing REC, with administrative reviews underway at two other health authorities. Findings will be disseminated through peer-reviewed publications, conference presentations and collaborative knowledge-mobilisation activities with clinical and community partners, including practice-oriented tools and accessible materials for adolescents and parents.