Understanding patients' experiences accessing primary health care (PHC) is necessary to improve service organisation. This study aims to examine individual, organisational, and contextual factors associated with patients' experience of accessing the multidisciplinary PHC clinic to which they are attached. This cross-sectional study builds on survey data collected in multidisciplinary PHC clinics located in 14 regions in the province of Quebec (Canada). Between September 2022 and June 2023, an online questionnaire was sent to patients with an email contact and attached to a family physician. Two patient-reported experience measures were assessed: (1) difficulty obtaining an appointment with their regular family physician or nurse practitioner and (2) perceived unmet healthcare needs. A self-reported online questionnaire based on the advanced access model was also sent to PHC professionals and administrative staff to assess the use of advanced access strategies in their practice. Multilevel logistic regression models were fit. Stratified analyses were conducted according to the number of consultations received. In total, 122,397 patients and 847 family physicians, 97 nurse practitioners and 347 administrative staff nested into 104 clinics answered the survey. In the overall sample, having a chronic disorder was the only individual factor associated with the patient experience of access. Organizational factors including estimation of demand and supply, use of a referral algorithm, and strategies to optimise consultations were associated with a better access experience. Patients from medium size clinics compared to small clinics had better experiences of care for both outcomes. Stratified analysis indicated similar results for patients who consulted at the clinic 1-5 times in the last 12months as observed in the overall sample. This study indicates that enhancing organizational processes can improve patients' access experiences.