Hydrogen is a green energy vector that is considered to be one of the most promising fuels for the future. One of the devices that uses hydrogen as fuel is the fuel cell. Through this electrochemical system, it is possible to produce clean electricity in which the waste product is steam water. There are different types of fuel cells, but in this Special Issue we will only consider devices that operate at low temperatures and that use hydrogen as fuel. Among these, we will consider the H₂-polymer electrolyte membrane fuel cell, and alkaline fuel cells, devices. The hydrogen storage issue is critical to the growth of hydrogen fuel cells for both stationary and mobile applications. Three types of techniques can be used for hydrogen storage: compressed, liquid, and stored in a solid material. In Hydrogen Storage and Fuel Cells | Materials, Characterization, and Applications, we will focus our attention on the latter method, considering all kind of materials such as metal hydrides, chemical hydrides, carbon materials, the metallic organic framework, and composite materials. Moreover, there will be particular attention paid to engineering and problems related to the integration of H₂ storage systems and fuel cell devices. Attention will also be paid to the commercial aspect and the development of the individual and/or integrated H₂ storage system/fuel cell. This Special Issue of Materials will cover but will not be limited to the following topics: Hydrogen storage; Hydrogen storage review; Metal hydrides; Chemical hydrides; High surface area adsorbents; Fuel cells; Polymer electrolyte membrane fuel cells (PEMFC); Alkaline membrane fuel cells (AMFC); Hydrogen storage systems and fuel cells interaction: engineering aspects; Near-term markets.