In recent years, the focus on decarbonizing the iron and steel industry has led to the increasing prominence of direct reduction of iron ore employing green hydrogen as a CO2-lean alternative to conventional methods. Despite ongoing developments, the production of hydrogen using renewable energy is expected to remain a significant bottleneck. Therefore, improving reduction efficiency and productivity through optimal utilization of green hydrogen is necessary, emphasizing a thorough understanding of the reduction kinetics and mechanism. The present research investigates the hydrogen-based reduction of industrial Hematite iron ore pellets. The isothermal reduction experiments were carried out using pure H2 in a custom-designed thermogravimetric setup. The potential reduction mechanisms were analyzed and discussed through the application of mathematical models and microstructural observations of the reduced samples.