Brucellosis is a zoonotic disease, seen globally, especially in developing countries and it can affect many organs. Urinary involvement of this disease is a very rare. Pyelonephritis, interstitial nephritis, glomerulonephritis, nephropathy are the reported urinary involvements. In this study, we aimed to report a case of Brucella pyelonephritis, who had complaints mimicking acute bacterial pyelonephritis, with a history of polycystic kidney disease and calculi in the left kidney