This technology roadmap uses scenario analysis to explore three possible futures for ammonia production. In the Stated Policies Scenario, the industry follows current trends, making incremental improvements but falling well short of a sustainable trajectory. In the Sustainable Development Scenario, the sector adopts the technologies and policies required to put it on a pathway aligned with the goals of the Paris Agreement. The Net Zero Emissions by 2050 Scenario describes a trajectory for the ammonia industry that is compatible with reaching net-zero emissions globally for the energy system by 2050. The roadmap concludes with a chapter outlining the necessary roles and actions of key stakeholders, namely governments, producers, and financial and research institutions, and establishes milestones and decision points.