The IAEA’s World Fusion Outlook aims to be the global reference for authoritative information and updates on fusion energy—a potentially unlimited, low carbon source of clean energy, which can contribute to decarbonization and diversification of energy generation in the long term. The IAEA has been promoting fusion energy research and development for over 60 years, and it continues to strongly support research and development and future deployment by bringing the fusion community together to create solutions for both scientific and technological challenges. This first issue of the publication outlines achievements in fusion energy; its safety, security, safeguards, nuclear law and liability challenges; as well as the role of the IAEA and its ongoing efforts.