Among the most promising strategies for reducing carbon dioxide (CO2) buildup in the environment and addressing the need for sustainable energy is converting CO2 into fuels and value-added products. To reduce CO2 emissions, renewable carbon could serve as a substitute for fossil fuels like coal and petroleum. The newest technology and processes must be implemented to develop innovative carbon recycling techniques for CO2. One possible solution for CO2 sequestration is the electrochemical transformation of the stable molecule into useful fuel or products. In addition to homogeneous and heterogeneous catalysts, photocatalysis, electrochemical, thermochemical, and bioelectrochemical reduction methods can be used to create value-added products. Among these methods, bioelectrochemical systems (BESs) play a crucial role in addressing the energy issue and mitigating global warming. Potential applications for BESs include waste biorefineries, pollution treatment, CO2 capture, and the electrochemical synthesis of eco-friendly biofuels or byproducts. This chapter covers the use of BESs in producing methanol from CO2.