ABSTRACT Introduction: Increasing of obesity become endemic problem in childbearing age of women. Therefore, this morbidity frequently found in pregnancy with all of the obesity consequences. Some problems in developing country like Indonesia, especially in our tertiary hospital also experienced burden situation of obesity in pregnancy cases. Aims:To describe obesity in pregnancy cases and analyze obesity status before pregnancy on obstetric outcome of this morbidity Material and methods:Retrospective case control study using medical record on singleton pregnancy complicated with obesity in major East Java tertiary referral hospital in one year. Results:of 1144 deliveries, we revealed 337 cases (29%) of obesity. 246 cases were included and analyzed in this study. Majority of cases were multiparity (72.8%), with age of 31.5±5.6 y.o, BMI of 35.6±4.9 kg/m2 with 19.5% had morbidly obese status.48% of cases had obesity status before pregnancy. Pre pregnancy obesity status not related to Cesarean Section delivery (P=0.07), the occurrence of preeclampsia (P=0.35), gestational diabetes (P=0.97) and fetal macrosomia (P=0.97). Pre pregnancy obesity status related to higher BMI status at delivery (P<0.001) and morbidly obesity condition (P<0.001; OR 5.96; CI 2.58-13.77) Conclusion:Our study revealed high incidence of obesity during pregnancy. While obesity correlated well with obstetric morbidity, pre pregnancy body mass index status did not associated with obstetric complication in pregnant obesity cases. Higher BMI and morbidly obese pregnancy cases due to pre pregnancy obesity status may contribute to nonsignificant increase of cesarean section.