Hem-o-Lok clips (Weck Surgical Instruments, Teleflex Medical, Durham, North Carolina, USA) are widely used in robot-assisted laparoscopic radical prostatectomy because of their easy application and secure clamping. To date, there have been some reports of their migration into the urinary tract, causing urethral erosion, bladder neck contractures orcalculus formation. We report a case of endourethral migration of a hem-o-lok after robot-assisted laparoscopic prostatectomy. The hem-o-lok was almost completely endoluminal and attached to one end at the vesico-urethral anastomosis. The hem-o-lok was easily removed cystoscopically by using an endoscopic forceps.