BackgroundA better understanding of the processes of collaboration between midwives who work in the birthing centers, and hospital-based obstetricians, family physicians and nurses may promote cooperation among professionals providing maternity care in both institutions. The aim of this research was to explore the barriers and facilitators of the interprofessional and interorganizational collaboration between midwives in birthing centers and other health care professionals in hospitals in Quebec.MethodsA case study design was adopted. Data were collected through semi-structured interviews with midwives, multidisciplinary professionals and administrators, through direct observation of activities in maternity units and field notes, and a variety of organizational and policy documents and archives. A qualitative thematic analysis method was used for analyzing transcribed verbatim.ResultsThe study suggests the close intertwinement between interactional, organizational and systemic factors in regard to barriers and opportunities for collaboration between midwives in birthing centers, and physicians and nurses in hospitals in Quebec. At interactional level, our findings show a conflict in scope of midwifery practice, myth about midwives, pre-judgment, and lack of communication skills between health care providers in the studied birthing center and hospital. At the organizational level, this investigation shows that although midwives have complete access to the hospital with which a formal agreement was signed, they were not integrated in hospital because of lack of interest of midwives and differences in philosophy and scope of practice among healthcare professionals as well as the culture of organizations. At a systemic level, in spite of excessive demand for midwifery care, there are not enough midwives to cover these demands.ConclusionMaternity care professionals require taking a collaborative approach in working and the boundaries of responsibility need to be redrawn. The inter-professional collaborative work between midwives and other maternity care professionals is crucial to improve access and women’s choices for maternity care in Canada. Although having collaborative and multidisciplinary teamwork is a goal of maternity care systems, it is hard to achieve.Electronic supplementary materialThe online version of this article (doi:10.1186/s12884-017-1381-x) contains supplementary material, which is available to authorized users.