Background: Gestational Diabetes Mellitus (GDM) is a prevalent disease during pregnancy which has detrimental effects on both the mother and the baby. Present study was aimed at Study of Knowledge Attitude and Practice regarding screening for Gestational diabetes mellitus and role of medical nutrition therapy in antenatal patient in Lok Nayak Hospital Delhi. Material and Methods: Present study was a cross-sectional study, conducted in pregnant women of age more than or equal to 18 years attending Antenatal OPD. Results: In present study, 200 pregnant women were screened out of those 118 were non- diabetic & 82 were diagnosed cases of GDM. Among 82 GDM cases, 61 were receiving MNT only while 21 were on treatment (either OHA or insulin or both). Majority participants were not aware about HBA1C (95.5 %), were not aware of the fact that fasting status was required for rightly conducting OGTT (50.5 %), had not heard about OGTT (78.5%),were not aware about screening method for GDM (79 %), were oblivious of the fact that history of GDM in previous pregnancy is a risk factor (69 %) & were not acquainted with the condition of GDM (54 %). Majority were aware that all pregnancies Should be screened routinely for GDM (73 %), that early diagnosis crucial for preventing complications (68.5%). Majority were following up with weight during pregnancy (60 %) & were visiting doctor regularly during pregnancy (58.5 %). Among diagnosed cases of GDM, majority participants followed diet prescribed by health professional (23 %), remaining followed own diet (11 %) while 10 participants were not following diet at all (5 %). Conclusion: This study highlights a lack of awareness about Gestational Diabetes Mellitus (GDM) among pregnant Indian women.