Urachal carcinoma of the bladder is a very rare tumor which has to be differentiated from primary adenocarcinoma of the urinary bladder. The treatment of choice is extended partial cystectomy with inclusion of the umbilicus and the peritoneum. Symptoms occur late and the diagnosis has to be made by preoperative transurethral biopsy. We herein report on 3 cases of urachal adenocarcinoma of the urinary bladder and reviewed the literature.