Background: Gestational diabetes mellitus (GDM) is one of the most common metabolic disorders complicating pregnancy and is associated with adverse maternal and neonatal outcomes. Early diagnosis and appropriate management can significantly reduce pregnancy-related complications.Objective: To evaluate maternal and neonatal outcomes among pregnant women diagnosed with gestational diabetes mellitus.Methods: A hospital-based prospective observational study was conducted among 200 pregnant women diagnosed with GDM who delivered at a tertiary care hospital between January 2024 and December 2024. Maternal demographic characteristics, obstetric complications, delivery outcomes, and neonatal outcomes were analyzed using descriptive and inferential statistics.Results: The mean maternal age was 29.8 ± 4.7 years, with 58.0% being multiparous. Cesarean delivery was performed in 46.5% of women. Pregnancy-induced hypertension occurred in 18.0%, polyhydramnios in 10.5%, and preterm delivery in 14.0%. Neonatal complications included macrosomia (20.5%), neonatal hypoglycemia (15.5%), respiratory distress syndrome (10.0%), hyperbilirubinemia (12.5%), neonatal intensive care unit (NICU) admission (18.0%), and congenital anomalies (3.0%). Good glycemic control was associated with significantly fewer maternal and neonatal complications.Conclusion: Gestational diabetes mellitus is associated with increased maternal and neonatal morbidity. Early screening, strict glycemic control, multidisciplinary antenatal care, and timely obstetric intervention substantially improve pregnancy outcomes.