Objective: To evaluate pattern of erectile dysfunction (ED) in diabetic patients, common types and risk factors of it. Patient's and Methods: 102 male diabetic patients complaining from ED were subjected to complete history taking including age and smoking and sexual history including the onset of ED and onset and duration of diabetes mellitus (DM), general examination including blood pressure and the body mass index (BMI), the genital examination including the Penis: (size, girth and peyronei's) and genital reflexes. Investigation including Hormonal assay of Serum Total and free testosterone and lipid profile. A Penile duplex was done to all patients. Results: the mean age of patients studied was 52.03 ± 10.79 years, mean duration of diabetes was 8.45 ± 6.45 years, 24 patients with DM type 1 and 78 with type 2 DM. According to pattern of ED; Psychogenic ED are present in 16 patients and organic ED in 86, organic ED types are 34 of arterial nature, 28 patients of venous nature, and mixed vascular in 17 patients and a neurogenic in 7 patients. Relation between Hypertension (HTN), Hyperlipidemia and Pattern of ED showing statistical significance. Conclusion: the main pattern of erectile dysfunction in DM is organic in nature and the cavernous arterial insufficiency is closely related to the DM. Hypertension and hyperlipidemia is strongly associated with erectile dysfunction in diabetics.