INTRODUCTION: Migrant women sex workers (MWSWs) are affected by higher morbidity rates, reflecting the complex health risks associated with sex work and migration which they face. This study aimed to assess MWSWs' use of primary care services in France, as well as the factors associated with having a family doctor. METHODS: This cross-sectional observational study of 135 cisgender and transgender MWSWs is part of the larger Favoriser l'Accès à la Santé Sexuelle des Travailleuses du Sexe project, which aims to improve global knowledge of and access to sexual healthcare among this population. MWSWs aged 18 years and older were enrolled over 1 year between 2022 and 2023. The primary outcome was the percentage of MWSWs who reported having a family doctor. A best model analysis and a regression model were used to examine associations between having a family doctor and MWSWs' health and social characteristics. RESULTS: Only 33% of participants reported having a family doctor. Among these, 24% had disclosed they were sex workers to the latter. In general, MWSWs had poor access to preventive healthcare (33% had been HIV tested in the previous year, 33% had used contraception and 19% reported lifetime cervical cancer screening). In contrast, most participants (63.5%) perceived they were in good health. In the multivariate analysis, having a family doctor was not significantly associated with better health outcomes or with the quality of healthcare. CONCLUSIONS: The majority of MWSWs did not have a family doctor; this fact compounds existing health vulnerabilities faced by this marginalised population. Improved targeted interventions are needed to increase healthcare access and quality for MWSWs. These interventions should include strategies to enhance communication with healthcare providers about this population's specific needs.< Réduire