<ns4:p><ns4:bold>Background: </ns4:bold>Worldwide, the occurrence of obesity has markedly increased over the past decades with serious public health consequences. Obese pregnant women are more likely to develop hypertension, pre-eclampsia and gestational diabetes, resulting in obstetric complications which in turn may contribute to an increase in adverse child outcomes and maternal mortality. The present study was done to determine the prevalence of obesity and its association with socio-demographic variables, obstetric history and mental health.</ns4:p><ns4:p> <ns4:bold>Methods:</ns4:bold> This study was nested within an ongoing cohort study, CASCADE, in a public hospital in Bangalore. The study participants comprised of 280 pregnant women who were 18 years of age and above, with a gestational age of less than 24 weeks, enrolled between a period of August 1<ns4:sup>st</ns4:sup>, 2017 until April 30<ns4:sup>th</ns4:sup>, 2018. Weight and height were measured using calibrated devices to calculate the body mass index.</ns4:p><ns4:p> <ns4:bold>Results:</ns4:bold> The prevalence of obesity was observed to be 33.9% among the pregnant mothers. Obesity was found to be significantly associated with age, history of abortion, gravidity on multivariate logistic regression. No association was found with depression and anxiety.</ns4:p><ns4:p> <ns4:bold>Conclusions: </ns4:bold>Obesity is an important health concern among urban pregnant women in the region of South India. The prevalence is much higher than that reported in other studies. Increasing age, multigravidity and past history of abortion were significantly associated with maternal obesity.</ns4:p>