The maritime industry is undergoing a significant transformation towards decarbonization, prompting a shift towards green fuel alternatives. Biofuels derived from organic materials are becoming increasingly popular due to their availability and compatibility with existing infrastructure, offering a seamless transition for marine vessels. Methanol, a versatile fuel sourced from various industrial processes, is gaining momentum in maritime use but requires careful handling due to safety risks. Hydrogen, particularly green, blue, and grey variants, is being explored for its sustainability, with each type presenting different production methods and environmental impacts. However, safety measures are crucial due to hydrogen's high flammability. Ammonia, traditionally used in agriculture, is being considered as a marine fuel option due to its renewable production potential and global capacity. The article showcases the ongoing efforts in the maritime sector to embrace sustainable alternatives and outlines key fuel options driving the industry's green revolution.