ABSTRACT: Tribal populations in India are considered to be socio-economically the most disadvantaged group and tribal children have very poor health indicators when compared to the rest of the population. In the present study an attempt has been made to assess the nutritional status of under- five years age group among the Rabha children of Udalguri district, Assam, India. For assessing the nutritional status of children, three anthropometric indices- height for age, weight for height and weight for age, which are considered as good indicators of assessment of nutritional status were adopted. Among the 225 children who were assessed for malnutrition, 93 (41.33%) were stunted, 62 (27.56%) wasted and 68 (30.22%) underweight as per WHO Growth Standards. The prevalence of malnutrition was found more common in girls as compared to boys. Education of the mothers was found to have a strong inverse relationship with all three measures of nutritional status. Education among the parents to improve nutritional status in the children as well as modification in the lifestyle can help to decline this health concern.