Background: The number of older diabetic patients in Vietnam is increasing every year, accompanied by digestive disorders. In Vietnam, rarely researches about prevalence of constipation for older diabetics focused on older patient. Objectives: Determine the prevalence of constipation in older diabetic patients. Methods: A cross-sectional study was conducted in National Geriatric hospital with 203 participants from 10th July to 10th October, 2020. Questionnaires and tests were used to obtain the prevalence of constipation determined by ROME IV, Bristol stool form scale. Results: Of 203 interviewers, mean age was 73.64 (SD = 8.09), 56.2% were female. 48% of them get constipation. According gender, in female: 59.8%; in male: 40.2% constipation. Conclusion: These results provided that there is a high rate of constipation in older diabetic patients. Clinician should pay more attention to the elderly with diabetes to early diagnosis for constipation.