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Background & Objective: Post-general anesthesia urinary retention is a common and bothering complication. In this study prediction value of IPSS for post-general anesthesia urinary retention was evaluated. Materials & Methods: This prospective study include 100 male patients over 50 years old who were candidated for nenurologic and non-nenurological elective surgery without any urology and neurologic past medial history. IPSS was calculated for each patient. The patients were followed in post operative period for urinary retention. Results: 1.8% of patients who had mild symptoms (IPSS=0-7) had urinary retention in 2nd 24 hours of post-operative period, 20% of patients who had IPSS=8-19 and 53.3% of patients with IPSS=20-53 had urinary retention at same period (P<0.05). Conclusion: IPSS can predict postoperative urinary retention in elderly male patients. If severe symptoms by IPSS was encountered the patients and health care personals must be cautioned about possibility of postoperative urinary retention and if required urologic consulation.