Youth mental health (YMH) services are greatly underutilized, particularly for migrant youth. Collaborative models of care offer promising avenues, but research on these treatment modalities is still scarce, particularly for migrants. The goal of this exploratory study is to better understand quality of care including factors improving access to care and collaborative YMH services use, efficacy and satisfaction, for this vulnerable population. This qualitative study relies on a multi-informants (youth, parents, clinicians) and multiple case study design to explore YMH collaborative services for migrant youth living in an urban setting (Montreal, Canada). Participants are five young patients (12-15 years old), one of their parents and their primary care therapist (N=15). They come from migrant families, have a psychiatric diagnosis and have been receiving mental health services in a collaborative care setting for at least 6 months. Transcripts of semi-structured interviews for the five triads were thematically analyzed to draw similarities and contrasts between actors, across and within case-studies. Based on these findings, four themes emerged concerning the optimal care setting for collaborative YMH services for migrant families: (1) providing an equilibrium between communication, collaboration and privacy/confidentiality, (2) special attention to ensuring the continuity of care and the creation of a welcoming environment where trusting relationships can develop, (3) the inclusion of family intervention, and (4) the provision of collaborative decision-making pathways to care, addressing interprofessional and interinstitutional collaboration as well as cultural differences in explanatory models and values.