Abstract: Polyhydramnios is an important obstetric complication with increased maternal morbidity. Undoubtedly, ultrasound is the best means to diagnose polyhydramnios USG has revolutionized the process of assessment of amniotic fluid thus becoming an integral part of fetal surveillance. In a low resource health facility as India with poor coverage of antenatal care and malnutrition it still becomes more important to screen pregnancies for such high risk factors. To determine the incidence and to assess the maternal outcome in patients diagnosed to have polyhydramnios in singleton pregnancies. The present study was conducted in Guahati Medical College for a period of one year from July 2017 to June 2018. All the patients were identified as having polyhydramnios using Largest pocket diameter method. The incidence of polyhydramnios in singleton pregnancy during the study period was 1.04 %. Majority of cases (76.61%) were mild, 14.03% moderate and 9.36 % severe polyhydramnios. Most common etiology was found to be idiopathic 69% followed by congenital anomalies19.8% and Diabetes Mellitus 10.52% Out of 171cases, 9 case was an abortion out of which 8 was induced due to fetal anomaly, 37 cases had preterm vaginal deliveries, 59 cases had full term vaginal deliveries, 66 cases had cesarean section. The most common maternal complication encountered was preterm labour and the most common malpresentations was breech. The study gives us the understanding of the impact of polyhydramnios on maternal outcome.