Noise is unwanted and unpleasant sound. The noise in the hospitals disturbs the patients and employees. Therefore, the noise levels in hospitals should be monitored and measured continuously. This study was carried out to find the noise level in Zeynep Kamil Hospital. In this research, DT-805 model, CEM brand sound meter was used. This study in the hospital was performed on Tuesday, Friday and Saturday in the operating room, clinic and outpatient departments. As a result of this study, the highest average noise level measured at the hospital is 81.25 +/- 3.21 dB and the lowest noise level is 52.51 +/- 2.37 dB. Noise level of outpatient was higher than operating room and clinics. In outpatient, in clinics and in the operating room, the night noise level was found to be lower than the daytime. The noise levels measured in this study are much higher than the internationally recommended noise levels.