Myocardial infarction (MCI) is a leading cause of death worldwide. Gender differences in long term mortality after MCI lead to a specific physiologic pattern of myocardial regeneration. Moreover mortality after MCI was reported to be higher in women. Left ventricular remodeling is cardiac wound healing after MCI indicate a high risk of heart failure and death. This remodeling can importantly affect the function of the ventricle and prognosis for survival which can be diagnosed by echocardiography. Controversial information excert about the role of androgen in cardiac remodeling. Even the evidence still debatable, androgen has a role in left ventricular (LV) remodeling and protect heart from maladaptive fibrosis. A prospective analytical observational study was conducted to evaluate the role of testosterone in LV remodeling in acute myocardial infarction patients. The study comprised 60 men aged 40–77 years with acute myocardial infarction in Dr. Hasan Sadikin Hospital during March–October 2015. Echocardiographyc study and the level of total, free, and bioavailable testosterone were measured twice. The first measured when they diagnosed acute myocardial infarction and the second after 4–6 weeks. The age of patient was 56.16±8.487 years old. Comparing the first and the second measure indicate that total testosterone significantly increased (785.00±661.76 ng/dL vs 822.33±365.64 ng/dL, p=0.004), free testosterone decreased (24.66±17.91 ng/dL vs 19.00±15.24 ng/dL, p=0.067), and bioavailable testosteron decreased (475.21±353.10 ng/dL vs 394.98±314.85 ng/dL, p=0.166). Correlation analysis by rank Spearman showed significantly correlation between free testosterone with relative wall thickness (p=0.019), and bioavailable testosterone with relative wall thickness (p=0.014). It is concluded that testosterone has a role on LV remodeling process after myocardial infarction showed by increasing of total testosterone and decreasing of free and bioavailable testosterone which have great affinity with cardiomyocyte.