Background: Myocardial infarction (MI) or acute myocardial infarction (AMI), commonly known as a heart attack, occurs when blood flow stops to a part of the heart causing damage to the heart muscle. The most common symptom is chest pain or discomfort which may travel into the shoulder, arm, back, neck, or jaw. Objective: To see the comparison in hospital complications and mortality between diabetic and non-diabetic patients of acute anterior MI. Methodology: This cross-sectional observational study was conducted in the Department of Cardiology, Sylhet MAG Osmani Medical College Hospital, Sylhet over a period of two years from July 2015 to June 2017. A total of 100 acute anterior MI patients (50 diabetic and 50 non diabetic) were included in this study. Acute anterior MI patients admitted after 6 hours of symptom onset or who did not receive streptokinase were excluded. Results: Male predominance was obvious in both groups [40 (80%) versus 42 (84%); p>0.05] in diabetic and non-diabetic group respectively. Mean age was 53.34 ± 11.32 and 54.84 ± 14.12 years in diabetic and non-diabetic groups respectively. Dyslipidemia [6 (12%) versus 6 (12%); p >0.05], Smoking [32 (64%) versus 34 (68%); p >0.05] and Family history of cardiovascular disease [6 (12%) versus 4 (8%); p >0.05] were similar among diabetic and non-diabetic respectively. Hypertension was found more among non-diabetic [27 (54%) versus 19 (38%); p>0.05] but difference was not statistically significant. Diabetic group had more acute MR [2 (4%) versus 0 (0%); p>0.05] but was not significant. Death was more in diabetic group than that of non-diabetic group [7 (14%) versus 3 (6%); p>0.05] but it was statistically not significant. Conclusion: Post MI angina was higher in diabetic than non-diabetic patients. Mechanical complications were also more in diabetic patients. However rate of reinfarction was higher among non-diabetic than that in diabetic patients. Mortality rate was higher in diabetic than that in non-diabetic patients. So, it may be concluded from the present study that in-hospital complications and mortality of acute anterior myocardial infarction are comparatively more in diabetic patients than in non-diabetic patients.