Objective: To determine the frequency of post-operative complications of transurethral resection of prostate (TURP), in benign prostatic hyperplasia (BPH) patients, using the Modified Clavien Classification System (MCCS). Study Design: Descriptive study. Setting: Urology Department, Sindh Institute of Urology and Transplantation, Karachi. Period: 26th May, 2019 to 25th Nov, 2019. Material & Methods: A total number of 162 patients with benign prostatic hyperplasia planned for TURP were included in this study and Post-operative complications data was collected, and classified according to the Modified Clavien Classification System (MCCS). Patient’s demographics and other parameters like prostate volume, operative time, mean prostatic tissue resected and hospital stay was collected. Results: Mean age was 63.32±8.36 years. Mean prostate volume was 56.99±13.25 grams. Mean operative time was 26.55±9.46 mins. Mean prostate tissue resected was 16.75±12.09 grams. Mean hospital stay was 1.27±0.60 mins. Grade I complication was occurred in 06 (3.70%) patients, grade II in 03 (1.85%) patients, grade III in 00 patients, grade IV in 01 (0.62%) patients and grade V in no patient. While there were no complications in remaining 152 (93.83%) patients. Conclusion: Clavien–Dindo classification system can be easily applied by urologists to grade the post-operative transurethral resection of prostate (TURP) complications. We observed that TURP is a very safe procedure for surgical management of benign prostatic hyperplasia, and is having low morbidity and mortality.