Global climate change is one of the most challenging problems of today's world and its effects have become more noticeable day after day. The magnitude of climate change is closely related to our carbon footprint, so replacing the resources such as petroleum, coal, nuclear energy by which humankind generates their energy requirements with new ones is essential. The usage of renewable energy resources is one of the effective ways to decrease CO2 emissions and environmental pollution. Biomass energy is one of the promising future energies as a renewable resource. Therefore, many requirements should be considered and evaluated carefully to produce and sustain a successful biomass energy system. This chapter presents a review of academic research attempting to face the biomass energy sector's problems using multi-criteria decision-making (MCDM) methods. Related articles in the international journals from 2010 to 2021 are collected and reviewed to answer the following questions: (1) Which methods are mainly used? (2) Which problems attract the most attention?