The increasing global energy demand and the environmental impacts of fossil fuel consumption have driven the exploration of sustainable alternatives such as biofuels. Among these, biodiesel and bioethanol stand out for their potential to significantly reduce carbon emissions and dependency on petroleum-based fuels. The integration of nanotechnology into bioenergy production processes has emerged as a transformative approach, enhancing both efficiency and sustainability. This chapter delves into the synthesis and application of advanced nanomaterials during bioenergy production, highlighting their unique physicochemical properties such as high surface area, catalytic activity, and thermal stability that contribute to improved biomass conversion. Various nanomaterials, including carbon nanotubes, magnetic nanoparticles, metal and metal-oxide nanoparticles, and metal-organic frameworks (MOFs), have been shown to enhance key biofuel production pathways such as transesterification, fermentation, and hydrolysis. Innovations such as sulfonic acid-functionalized MOFs and hydrothermal-assisted carbonization have achieved remarkable yields, demonstrating the scalability of nanocatalysts. Additionally, the use of nanomaterials in biogas and biohydrogen production has been shown to enhance microbial activity and substrate degradation efficiency. Despite these advances, challenges related to nanomaterial toxicity, environmental impact, cost-effectiveness, and large-scale implementation persist. The integration of nanotechnology in biomass conversion not only enhances biofuel yields but also offers pathways toward cleaner, economically viable, and technologically advanced energy systems.