This international workshop is organised by the NEA, the International Atomic Energy Agency (IAEA) and the European Commission’s Joint Research Centre (JRC). Its goal is to collaboratively develop a comprehensive taxonomy of fuel-cycle options for molten salt reactor (MSR) technologies, covering chloride and fluoride-based salts, and to establish a clear, unified terminology for communicating these complex processes. The effort builds on the MSR taxonomy from the 2023 IAEA‑TRS‑489 report on molten salt reactor technology. By combining the strengths of all three organizations, the workshop seeks to optimise technical expertise, ultimately advancing the roadmap toward MSR deployment and support in policy development.