The Hydrogen Internal Combustion Engine (H2-ICE) Market is on a rapid upward trajectory, with projections indicating substantial growth in the coming years. Valued at USD 20.06 billion in 2024, the market is expected to surge to USD 51.76 billion by 2034, showcasing a strong compound annual growth rate (CAGR) of 9.94%. This expansion is primarily fueled by the global push for transportation decarbonization, where H2-ICE emerges as a strategic alternative to battery electric vehicles (BEVs) and fuel cell vehicles (FCVs). While BEVs excel in efficiency and FCVs boast zero-emission elegance, H2-ICE offers familiarity with the internal combustion engine concept while eliminating carbon emissions. The core functionality of an H2-ICE resembles a traditional internal combustion engine, burning hydrogen gas with spark ignition instead of diesel or gasoline. Two main types exist - port-injected engines and direct-injected engines - each offering unique advantages in combustion control and power density. H2-ICEs, although less efficient than FCVs or BEVs, are cost-effective and compatible with existing ICE platforms, making them suitable for challenging-to-electrify sectors. The market is witnessing significant growth globally, with Europe leading in 2024 due to aggressive decarbonization policies and investment in hydrogen infrastructure. North America and Asia-Pacific are also on the rise, propelled by government initiatives and industry efforts. Major players such as Cummins, Toyota, and Hyundai are actively innovating in the H2-ICE space, developing advanced technologies like direct injection systems and dual-fuel capabilities to enhance performance and emissions control. The future of hydrogen internal combustion engines looks promising, with vast opportunities in various sectors and continued technological advancements driving the industry forward.