The International Maritime Organization (IMO) and the European Union (EU) have adopted specific regulations and initiatives to reduce greenhouse gas (GHG) emissions, with the aim of achieving net-zero emissions by 2050. This thesis explores the role of hydrogen as alternative zero-carbon maritime fuel, along with the infrastructure required for its production, storage and transport. Also, other alternative fuels such as ammonia and methanol are assessed as hydrogen carriers. The thesis evaluates electrolyte technologies for hydrogen production and examines the use of hydrogen in fuel cells and internal combustion engines for electricity generation and ship propulsion. In addition, ammonia and methanol are evaluated as marine fuels that are hydrogen carriers, and methylcyclohexane (MCH) is evaluated as a liquid organic hydrogen carrier. The methodology is based on a critical review and evaluation of scientific articles, technical reports and statistical data, complemented by the results of an interview with a senior representative of a specific company involved in the development of hydrogen-related marine decarbonization technologies, including MCH. In this master's thesis, the analysis of hydrogen focuses on technological maturity, energy efficiency, storage and transportation needs, safety, infrastructure requirements and operational suitability for marine applications. As demonstrated by the processing of all data, hydrogen cannot be considered as a universal substitute for conventional marine fuels for several reasons, such as safety issues, production costs, especially in the case of renewable energy sources, its availability at terminals around the world and, in general, it can be concluded that its applicability depends on the matching of the hydrogen form, storage method, propulsion technology and supporting infrastructure to the vessel and its operational profile.