Introduction: Gestational diabetes mellitus (GDM) is a common complication during pregnancy that affects both maternal and neonatal health outcomes. Identifying risk factors associated with GDM is crucial for early detection and intervention to improve pregnancy outcomes. Methods: This retrospective observational study was conducted at the Department of Gynecology, Gonoshasthaya Nagar Hospital, Dhaka, Bangladesh during the period of January 2019 to December 2019 with a total of 348 hospital patient records. Result: Of the 348 participants, 24.71% had GDM. Significant differences were observed between the groups in age, gravida, BMI distribution, family history of GDM, and previous history of GDM. Higher rates of non-spontaneous vaginal deliveries were found in the GDM group (36.05%) compared to the non-GDM group (22.52%). Age ≥35 years, obesity, family history of GDM, and history of GDM were significantly associated with GDM (p<0.05). Conclusion: Our findings support the existing evidence that advanced maternal age, obesity, family history of GDM, and previous history of GDM are significant risk factors for GDM. These results highlight the importance of early screening and intervention for high-risk groups to prevent adverse pregnancy outcomes.