Bladder dysfunction is one of the most common complications of diabetes, even exceeding nephropathy or peripheral neuropathy. Diabetic cystopathyaffects patients in both sexes, and its prevalence increases over time with diabetes; our concern is to evaluate the urodynamic findings of bladder dysfunction in diabetic patients.A cross sectional study conducted at Ghazi Al-Hariri Surgical specialized hospital during the period from the firsts of January 2018 to the end of Mar 2019, in which 118 diabetic patients (71 female and 47 male) with lower urinary tract symptoms were enrolled in the current study. The mean age (62±13) years old, 37.3% of patients presented with urgency as the main type of dysfunction. Diabetic cystopathy were found in (40,4%) of the male and (43.7%) of the female, while detrusor over activity were found in (15.5%) of the male and (18.3%) of the female, bladder outlet obstruction were represent (8.5%) of the male with significant association. Highly significant (<0.001) increase in female compliance and flow rate than that in male but highly significant decrease were found in female filling IV pressure. We concluded that Bladder over activity of the patients in the current study was found in more than half of the patients and diabetic cystopathy is the most common urodynamic finding in diabetic bladder dysfunction in patients with DM.