This study examines the associations between symptoms of mental disorders and diabetes and hypertension in a nationally representative sample of South Africans. We examined unadjusted and adjusted associations of socio-demographic characteristics, alcohol use and psychological distress with diabetes and hypertension. Multivariate logistic regression revealed that hypertension is significantly associated with age, while diabetes is significantly associated with age, population group and psychological distress. The association between psychological distress and diabetes found here suggests the usefulness of additional research using more detailed measures of psychiatric disorders in local studies and reinforces clinical calls for attention to psychiatric screening in patients with diabetes.