Short stunted stature is a condition where z-score for height per age is less than -2 SD. Stunted children have a risk of 3,4 times being obese adolescents. In stunted adolescents, there is a disruption of the fat oxidation process that can cause obesity. In addition, stunted adolescents are less active than non-stunted. The purpose of this study was to determine whether a sedentary lifestyle is a factor that increases the risk of obesity in stunted adolescents. This study is an analytical

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... with a cross sectional research design. The participants are 63 adolescent selected by purposive sampling. Measurement include z-score height per age and BMI per age. Sedentary lifestyle is determined using modified Adolescent Sedentary Activity Questionnaire (ASAQ) and it categorize high if ≥5 hours per day. Data was analyzed by Chi-square. Proportion of stunted obesity in SMPN 1 and 2 Pasar Kemis in Tangerang Distric is 44,4%. There was significant relationship between sedentary lifestyle and obesity in stunted adolescent (p=0,001). Sedentary lifestyle are factors that increase the risk of stunted obesity in adolescents of SMPN 1 and 2 Pasar Kemis in Tangerang Distric. From the results of this study, it is hoped that institutions will continue to provide guidance and outreach to students so that obesity does not occur stunted.