Purpose: This study aimed to assess the prevalence of oral manifestations of diabetic patients in a group of Egyptian population. Subjects and Methods: A cross- sectional study was conducted on 245 diabetic Egyptian patients. They were recruited from outpatient clinic of the Faculty of Dental Medicine for girls and Al-Azhar university hospitals. We assessed prevalence by collecting data from patients by questionnaire then clinical examination. We used HbA1c test to show its relation with oral manifestations. Results: The most frequent oral symptoms were xerostomia 77.1%, followed by toothache 51.1%, taste abnormality 50.2%, tender gum 38.8%, halitosis 32.7%, burning sensation 6.5% and mouth soreness 5.7%. While the most frequent dental findings were plaque accumulation in 92.1% followed by calculus deposition in 86.3%, bleeding with probing in 85.1%, dental caries in 62.6%, tooth mobility in 28.6% and finally gingival recession in 28.2%. Almost uncontrolled patients had more frequent manifestations than controlled ones. Conclusion: DM associated many oral manifestations and they are more prevalent in uncontrolled diabetic patients.