Purpose: Chronic hepatitis B virus infection affects more than 3 million people worldwide. The present study aimed to evaluate the role of pretreatment factor IV collagen as predictor of post treatment virological response with hepatic fibrosis regression. Materials and Methods: This prospective cohort study has been conducted on 74 naieve patients with chronic HBV infection with variable degree of hepatic fibrosis (F2, F3, ≥F4), viral load, and variable degree of abnormality in laboratory parameters of liver functions. All patients treated with Entecavir 0.5 mg/day or 1 mg/day according to severity of hepatic condition for 1 year. Liver fibrosis assessed using fibroscan, factor IV collagen, (APRI) and (FIB-4) scores evaluation. Results: All included patients in our study achieve post treatment Virological response with undetectable HBV DNA PCR ( Conclusion: Low pretreatment factor IV collagen is significantly correlated with virologial response and hepatic fibrosis regression post Entecavir therapy in patients with chronic HBV infection.