Hospitalized children are at risk of losing weight, causing malnutrition during the treatment period. The prevalence of hospital malnutrition in various countries is quite high. Hospital malnutrition (HM) can affect the prognosis and course of the disease by increasing the incidence of infection, slowing wound healing, reducing the bodys immunity, affecting the action of drugs, prolonging the length of treatment, and increasing morbidity and mortality rates. This study aims to describe the incidence of hospital malnutrition at pediatric inpatient ward. Methods : A descriptive study of all sick children aged 1 month to 18 years who were being treated in pediatric wards at H. Adam Malik General Hospital, from March - April 2023 were recruited for this study. Samples were collected using consecutive sampling. Primary data was obtained from interviews and anthropometric measurements, including body weight and height, were taken during hospital admission and discharge. Secondary data was obtained from medical records. Results: Fifty-five children were included with the average length of stay was 7 days. The prevalence of hospital malnutrition in children was 29.1%. Conclusion: The prevalence of hospital malnutrition at RSUP H. Adam Malik Medan has decreased compared to previous research. Even though the prevalence of malnutrition at H. Adam Malik Hospital has decreased, it is necessary to carry out regular training and evaluation of staff involved in using hospital malnutrition screening assessments.