Background:Any glucose intolerance that appears or is initially diagnosed during pregnancy is known as gestational diabetes mellitus, or GDM. The present study was conducted to evaluate HbA1c levels and its correlation with the pregnancy outcome. Materials & Methods:80 pregnant women with gestational diabetes mellitus (Group I) had >5.8% HbA1c level and 80 subjects (group II) (control) had <5.8% HbA1c level. Pregnancy outcomes were compared in relation to HbA1c values. Results: The age group 21-25 years had 36 in group I and 40 in group II, age group 26-30 years had 34 in group I and 26 in group II and >30 years had 10 in group I and 14 in group II. BMI was 18-25kg/m2 seen in 40 in group I and 32 in group II, 26-30kg/m2 in 32 in group I and 36 in group II and >30kg/m2 was seen in 8 in group I and 12 in group II. The difference was non- significant (P>0.05).UTI was seen in 6 in group I and 3 in group II, vulvo vaginal infections in 7 in group I and 4 in group II, pre-eclampsia was seen in 10 in group I and 2 in group II, polyhydramnios in 5 in group I and 1 in group II, preterm labour in 4 in group I and 8 in in group II, postpartum haemorrhage in 2 in group I and 1 in group II and caesarean deliveries in 21 in group I and 17 in group II. The difference was significant (P<0.05). Conclusion: Pre-eclampsia, polyhydramnios, preterm labor, UTI, vulvo vaginal infections, postpartum hemorrhage, and cesarean births were highly prevalent in individuals with gestational diabetes mellitus.