Introduction: ABO blood group can be associated with chronic diseases, for example, cancer and coronary heart disease, however it is not proven in Type 2 Diabetes Mellitus (T2DM). The aim of this study was to identify the association between the ABO blood group and disease control among T2DM patients at Kepala Batas, Penang. Methods: Approximately two mL vials of fresh blood were collected and typed using the tube method from 129 T2DM and 132 non-diabetic (control) patients, who visited the specialist clinic. The sociodemographic characteristics of the T2DM patients was analysed using descriptive analysis. The proportions of A, B, AB, and O blood groups among the diabetic and control patients were compared using the chi-square test. Any association between the ABO blood group and disease control was identified using the bivariate correlation test. Results: No significant association was found between the ABO group and T2DM patients (p = 0.152) when compared with the control group. However, blood group B was the most frequent among T2DM patients (33.3%) compared to blood group O within the control group (36.4%). Negative associations were observed between the ABO blood group and BMI (r = 0.098, p = 0.268), as well as the HbA1C value (r = -0.065, p = 0.464). Conclusion: No association was found between the ABO blood group and the associated risk factors (BMI and HbA1C). However, individuals with blood group B and risk factors, such as older age group, obesity, and high HbA1C value (more than 7.0%), should be monitored.