The Paris Agreement declares to hold the increase in the global average temperature to well below 2 °C above pre-industrial levels and to pursue efforts to limit the temperature increase to 1.5 °C above pre-industrial levels in 2050. The agreement includes the commitment to deliver long-term low-carbon development strategies. Accordingly, global warming has been regarded as a crucial issue in every industry. Since the long-term target was set on the basis of the Paris Agreement, innovative technologies to realize CO2 mitigation in 2050 are desired, including in the steel industry. Until now, many various technology developments have been carried out in the ironmaking area; however, more advanced progress beyond the past progressive developments is required in order to attain the long-term target in 2050. In addition to modification of the current blast furnace process, the ironmaking process will be diversified, and new concepts such as CCU (CO2 Capture and Utilization) process in collaboration with chemical industry and hydrogen-based ironmaking utilizing CO2-free renewable energy aiming at CDA (Carbon Direct Avoidance) will be pursued in order to intensify CO2 mitigation. This review focuses on the evaluation of the current technology development to date and the design of an ambitious ironmaking process for the future.