—Urinary Tract Infection (UTI) was the presence of the large number of microorganisms in the urine that can cause urinary tract infections. UTIs were infection whose incidence is still high in Indonesia. The main therapy of UTIs was using antibiotics. The immense of antibiotic use can cause irrationality. This irrationality would give some negative effects such as allergic reaction, physiological changes, and antibiotic resistance. The purpose of this study was to know the quality of antibiotic use in UTI patients in Kanjuruhan Region General Hospital. The type of research was observational by the cross-sectional design. The data were taken retrospectively during September-November 2019 and used the medical records of 27 UTI inpatients. The results of this study determined 20% including category 0 (approriate use of antibiotic), 2,86% category I (antibiotic use not correct timing); 28,57% category II A (antibiotic use not correct dose); 34,29% category II B (antibiotic use not correct interval); 11,42% category III B (antibiotic use is too short) and 2,86% category IV A (there is more effective alternative).