Macroalgae, as a sustainable feedstock for biofuel production, has garnered significant attention as a promising solution to today’s major energy and environmental challenges. This chapter offers an extensive overview of the essential elements related to the use of macroalgae for the manufacture of biofuels, including cultivation methods, conversion technologies, yield potential, and other significant factors. A wide variety of conversion pathways for the manufacture of biofuels, including bioethanol, biodiesel, and biohydrogen, are provided by the distinctive biochemical compositions of macroalgae, which are rich in carbohydrates, proteins, lipids, and bioactive chemicals. The review examines the effectiveness of different cultivation techniques for enhancing macroalgal growth and biomass yield, including traditional seaweed farming, open ocean cultivation, and integrated multi-trophic aquaculture. A comprehensive evaluation of conversion technologies, including enzymatic hydrolysis, fermentation, pyrolysis, and hydrothermal liquefaction, is conducted to explore their unique features, operating conditions, and potential yields. Additionally, a critical analysis of environmental and economic aspects is presented, addressing issues such as nutrient management, invasiveness, carbon footprint, cost-effectiveness, and scalability. In order to overcome the challenges and realize the full potential of macroalgae-based biofuels, collaboration is stressed among academics, industrial players, policymakers, and environmental organizations. Maximizing farming techniques, improving conversion technology, and ensuring the long-term sustainability of macroalgae biofuel production depends on ongoing research, innovation, and supportive legislation. By utilizing macro algae’s remarkable characteristics, we can hasten the transition to a greener and more sustainable energy future, thereby reducing climate change and promoting energy security.