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Introduction: Basic Health Research in 2018 stated Jember as a district with the third highest incidence of undernutrition in East Java. Undernutrition is a threat to future generations because it has short-term and long-term impacts that can be irreversible. This study aimed to determine the factors associated with undernutrition among children under five in Karangrejo Village, Jember Regency. Methods: This research used a cross-sectional method involving 94 mothers and children under five years old registered at Posyandu in Karangrejo Village who were selected by purposive sampling. The dependent variable included the sociodemographic factors of mothers and children and was obtained using a demographic questionnaire. The dependent variable, undernutrition, was determined based on weight-for-age and was obtained by plotting the child’s weight on the WHO weight-for-age curve: 0-5 years (z score) according to the child’s sex. Statistical tests used ordinal logistic regression tests. Results: There are some factors contributing to undernutrition, including the father’s education in elementary school (p=0.002, OR=5.628), the number of children no more than two persons (p=0.038, OR=-2.546), a complete history of immunization (p=0.011, OR=-4.627), history of infection of ARI every month and every two months (p =0.001, OR= -3.897, -7.250) respectively, and the level of mother’s knowledge about fulfilling children nutrition (p=0.000, OR= 5.593). Conclusions: This study suggests that raising parent education, complete immunization, and mothers’ knowledge are recommended to prevent undernutrition among children. Furthermore, the outcome of this study re-emphasizes that educational activities regarding children’s nutritional needs are still needed to improve mothers’ knowledge. Keywords: children; contributing factors; undernutrition