The global hydrogen engine market, valued at USD 4.10 billion in 2024, is set to soar to USD 34.25 billion by 2033, showcasing a robust CAGR of 26.60%. Hydrogen engines, emerging as a green alternative to traditional internal combustion engines, are gaining traction in heavy-duty sectors like trucks, buses, ships, and industrial machinery. The appeal lies in the zero carbon emissions during operation, offering a solution for industries striving to comply with emission regulations and reduce carbon footprints. Governments worldwide, including the EU and the US, are driving hydrogen engine adoption through stringent emission regulations and ambitious decarbonization goals, creating a strong market demand. However, challenges such as high production costs, limited refueling infrastructure, and competition from battery electric vehicles pose obstacles to widespread adoption. The market sees opportunities in expanding into industrial and marine sectors where long operational hours and high energy demands favor hydrogen engines. The maritime industry, in particular, is exploring hydrogen engines to reduce CO₂ emissions, aligning with decarbonization efforts. To overcome challenges and leverage opportunities, continuous innovation and investment in hydrogen production, storage, and infrastructure are crucial. The growth potential for hydrogen engines remains significant, driven by the need for cleaner energy solutions in heavy-duty applications and the ongoing global transition towards a more sustainable future.