Patients' falls during hospitalization at the Department of Hematology are a serious problem affecting the safety and quality of patients' lifes during the treatment. The aim of this study was to determine the frequency of falls in patients on the Hematology Department during one year, the most common factors for falling, causes and consequences of the falls, and to educate the nursing staff about the importance of risk assessment for the fall and fall prevention. The study was carried out between January 1st 2013 and January 1st 2014 at the Department of Hematology in Hospital Merkur. Information about the fall of the patients were collected from the "application sheets for patient's fall", incident reports, medical history, therapeutic lists, nursing observations and temperature charts. The Morse scale has been used to indicate the risk of falling. During 2013, the department of hematology reported 20 falls. The most common causes of falling were weakness, fainting, vertigo,anemia, reduced mobility, fever, uncritical patients, confusion and changes in the environment. In 18 patients' falls (90%) there were more than three risk factors for the fall. Nine falls had no consequences, while in the remaining eleven (55%) the most common were the pain at the site of trauma after four falls (36%) and hematoma after five falls (45%). According to the Morse scale 17 falls (85%) appeared in the patients with high risk for falling. Because of the many risk factors, hematology patients have a high risk for a fall during hospitalization. In order to improve the quality of our work we should improve fall risk assessment, conduct regular education and ensure adequate number of nursing staff.