The management of complicated urinary tract infection (UTI) remains a challenge since the coexisted conditions may significantly decrease the successful rate of treatment. In this chapter, the specific conditions including indwelling catheter, urolithiasis, neurogenic bladder, vesicoureteral reflux and pregnancy are listed. In terms of each condition, the potential influence on UTI and management strategy is discussed. Not only is the current evidence reviewed but also we present our experience on management of complicated UTI.