Introduction: A great variety of self-inflicted foreign bodies have been removed from the lower urinary tract and male external genitalia. Our case is a peculiar one. No such foreign body in urinary bladder has been reported so far in the literature. Case Presentation: A 14 year old boy came to us with complaints of pain, difficulty in voiding with dribbling of urine and subsequently developed acute urinary retention of 24 hours duration. On further questioning he gave an interesting history. While he was cleaning the fish tank in his house, he was holding a fish in his hand and went to the toilet for passing urine. While he was passing urine, the fish slipped from his hand and entered his urethra and then he developed all these symptoms. . Plain X ray KUB was normal. Abdominal Ultrasonogram showed normal kidneys, bladder was full and a 1.5 Cm echogenic object found inside the bladder without any after shadow. Management: With 19F cystoscopic sheath and 30 degree scope, cystourethroscopy was done. His urethra was normal. There was about 2 Cm long dead fish found inside the bladder. We tried to remove with biopsy forceps but unable to hold because of the smooth surface. Then we introduced rigid ureteroscope and with the help of stone grasper the fish was removed in Toto. Conclusion: Introduction into the bladder may be through self-insertion, iatrogenic means or migration from adjacent organs. Extraction should be tailored according to the nature of the foreign body and should minimize bladder and urethral trauma. The possibility of an intravesical foreign body should be considered in any patient with chronic unexplained lower urinary tract symptoms.