The triglyceride-glucose index is a newly discovered parameter that indicates insulin resistance. This study aims to investigate the relationship between the triglyceride-glucose index and triglyceride/high-density lipoprotein ratio with glycemic control in patients with type 2 diabetes mellitus. This study was performed retrospectively in 296 patients with type 2 diabetes mellitus. Patients were divided into two equal groups according to their HbA1c levels as having good glycemic control (HbA1c 7 and below) and poor glycemic control (HbA1c above 7). Age, gender, body mass index, fasting blood glucose, HbA1c, total cholesterol, serum triglyceride level, serum HDL level, serum LDL level, triglyceride-glucose index, and triglyceride/HDL ratio were compared between the groups. Fasting blood glucose, HbA1c, triglyceride, HDL, triglyceride-glucose index, and triglyceride/HDL ratio was significantly different between patient groups with good and poor blood glucose regulation (p0.05). Triglyceride-glucose index and triglyceride/HDL ratio may be indicators of poor glycemic control in diabetic individuals. These indices are cheaper, universal, and easy-to-measure parameters compared to HbA1c and can be used to predict glycemic regulation.