Background: Gestational diabetes is defined as glucose intolerance with its first onset or first recognition during pregnancy. Gestational diabetes patients are at an increased risk for both maternal and poor fetal outcome. Aim: This study was done to determine adverse maternal and perinatl outcome in women diagnosed with gestational diabetes. Materials and Methods: It is a retrospective study of women who were attending antenatal OPD and delivered in our institution and were diagnosed with gestational diabetes. Case records of previous two years of delivered women with gestational diabetes were studied from January 2016 to December 2017.Their demographic chracterstics, associated maternal comorbidities, adverse maternal and perinatal outcome were noted. Results: A total of 40 of gestational diabetes in our institution were studied between this 2 year period. 60% of patients belong to the age group 25-30 years. 20% belong to the rural and 80% belong to urban population. GDM patients had a higher rate of associated comorbidities like PIH, Hypothyroidism, high incidence of UTI and candidiasis, higher rate of cesarean delivery, higher admissions to NICU. 42.5% of patients had their blood glucose level controlled on di et al. one while rest required oral hypoglycemic and/or insulin. Majority of second gravida patients had GDM in their first pregnancy also. Conclusion: Since the prevalence and diagnosis of GDM is on an increase and is associated with adverse maternal as well as adverse fetal outcome, early diagnosis and a good control of blood sugar levels should be done in order to achieve optimal maternal and perinatal outcome.