Endometriosis affecting the urinary tract is very rare and the most common site of involvement is urinary bladder. The clinical features are urgency and frequency, hypo gastric pain and hematuria. Cystoscopic examination is the most valuable diagnostic test but definitive diagnosis requires histological confirmation. A 21-year-old unmarried female presented with lower urinary tract symptoms and blood in urine, more during menstruation. She gave history of left salpingo-oophorectomy. Ultrasonography revealed a mass in the bladder 2 x 3 cm on the posterior wall. Intravenous urography showed a filling defect in the bladder. Urethrocystoscopy performed and growth was resected and sent for histopathology. Histopathology confirmed the diagnosis of vesical endometriosis. She was advised Luteinizing hormone-releasing hormone (LHRH) but she refused as she could not afford it. She was managed on Tab 17-aethinyl testosterone.