Stunting is a condition resulting from poor nutrition or repeated infections that have a greater risk of contracting a disease to death. There are several risk factors, namely birth weight, short birth length, nutritional intake level, previous disease history (recurrent infections), parental education level, sanitation and drinking water conditions, and family economic status. This study aims to analyze the determinants of stunting in children. The design of this study is a cross-sectional study where the type of research that emphasizes the time of measurement/observation of independent and dependent variable data only once at a time, was carried out in Singkuang and Huta Godang Villages in Mandailing Natal Regency. We carried the time of the study out in July 2019. The target population in this study were all children aged 6 months to 5 years. In this study, poor nutritional intake, low parental education, and poor drinking water sources can increase the risk of stunting in children under five years of age. The determinants of stunting include birth weight and length, nutritional intake level, parental education level, family economic status, sanitation conditions, and clean drinking water sources, which together affect the incidence of stunting (p<0.005, each). To reduce the incidence of stunting, it is necessary to make efforts to improve each of the determinants including babies with low birth weight and length, inadequate levels of nutritional intake, low parental education levels, low family economic status, and conditions of sanitation and water sources. bad clean drinking.