Gestational diabetes is a high blood sugar condition that some women get during pregnancy. Usually it goes away after the baby is born, unlike other types of diabetes. Gestational diabetes generally starts when the baby is not able to make use of all the required quantity of insulin needed. Therefore enough insulin is not consumed by the baby resulting in builds up in the blood to higher level. The present study was conducted among the women who was diagnosed as type II diabetes mellitus to assess the incidence of history of gestational diabetes mellitus at SMVMC&H Puducherry. A qualitative research approach with non –experimental retrospective design was selected for this study. The study samples comprises of all women with type II diabetes mellitus attending medicine OPD, at SMVMC & H Puducherry. The incidence of gestational diabetes mellitus were assessed among the womens with type II diabetes mellitus and the related etiological factors were also identified. Therefore the findings of these study revealed the incidence of gestational diabetes mellitus among women with type II diabetes mellitus.