BACKGROUND: The learning needs of newly diagnosed diabetic patients followed up in medical offices in Reunion Island are unknown, although necessary for the improvement of education programmes and disease control. AIM: To assess the knowledge of type 2 diabetic patients in primary care followed for less than 5 years. METHOD: A cross-sectional study was carried out, using a self-questionnaire to assess patients’ knowledge of diabetes, complications, follow-up, diet and physical activity. Patients were recruited from medical offices in the western region of Reunion Island. RESULTS: From 23(rd) April to 31(st) July 2021, 89 patients were included. The knowledge level of the total sample was moderate (mean correct answers 65 % ± 17). The best knowledge levels were in the areas "generalities on diabetes" and "complications", while the lowest levels were in the categories "follow-up" and "diet and physical activity". Glycated haemoglobin, libido disorders, frequency of urinalysis and dental consultation, and the recommended diet for patients with diabetes which is the same as for the general population, were the least known concepts. CONCLUSION: This study revealed gaps in patients’ knowledge that could be used to improve education programmes which in turn could reduce or prevent diabetes complications.