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In women diagnosed with Gestational Diabetes Mellitus to determine association of gestational weight gain with adverse pregnancy outcomes Background Excessive GWG increases risks of caesarean delivery, hypertensive disorders, GDM and large for gestational age infants. Conflicting outcomes exists for GWG in GDM hence more research is needed. Aims and Objectives In women diagnosed with Gestational Diabetes Mellitus to determine association of gestational weight gain with adverse pregnancy outcomes Materials and Methodology This Analytical Cross-sectional study was conducted in JIPMER Obstetrics and Gynecology department from January 2022 to January 2024 after ethics committee approval. Women >37weeks pregnant were recruited through convenient sampling. Informed consent was obtained in English or Tamil. Data collected included socio-demographics, pre-pregnancy weigh, gestational age, blood pressure, OGTT values, thyroid function tests, diet, exercise, drug details, and side effects if any, Weight gain was calculated from pre-pregnancy/ first trimester to delivery weight. Women were categorized by weight gain per IOM 2009 recommendations. Results 44% of the study subjects had Adequate GWG, 38.5% belonged to the Inadequate weight gain category and 17.5% belonged to Excessive category. There were only 8 participants in the underweight category hence they have been excluded from the comparison. When compared to normal BMI category there was significant odds of adverse maternal outcomes in overweight and obese group of patients. Conclusion Excessive GWG was linked to higher rates of gestational hypertension, LSCS, and macrosomia. Inadequate GWG increased IUGR and pre-eclampsia, though not significantly. Stillbirths occurred in both inadequate and excessive GWG groups. Instrumental delivery rates were lower but not significantly different. No association was found between GWG and PROM, NICU admission, or neonatal RDS.