The US guideline for urinary tract infections has been applied in our country. However, clinical characteristics, etiology and antimicrobial susceptibility could differ from country to country, therefore, we tried to make diagnosis and treatment guideline for urinary tract infections based on published articles of antimicrobial treatment efficacy of UTI and available antimicrobial susceptibility of major pathogens causing urinary tract infections in our country, which reflects clinical situation in Korea. This guideline was developed by the committee of the Korean Society for Chemotherapy, and covers asymptomatic bacteriuria, bacterial prostatitis, uncomplicated and complicated urinary tract infections.