Sistemi di propulsione innovativi per autovettureThe recent growing attention to cleaner and more sustainable sources of power has led to an always higher importance of hydrogen in the automotive field. In this work, the main and more interesting properties of hydrogen are analyzed, together with the current technologies used to produce, store, and distribute it and the issues linked to them. An overview of the policies and incentives adopted by the European Commission to promote its use is also present. In particular, the path the European states should follow to reach the Union’s goals is described. The attention of the work is directed to hydrogen internal combustion engines; hence the functioning, the strengths, and the weaknesses of both direct and indirect injection hydrogen ICEs are investigated.