The topic "Hydrogen Trade and Cross-Border Complexity" addresses the emerging challenges and opportunities in the international exchange of hydrogen as a clean energy carrier. As countries seek to decarbonize their energy systems, hydrogen—particularly green hydrogen produced from renewable sources—is gaining prominence. However, cross-border hydrogen trade involves complex regulatory, technical, and logistical issues. These include the lack of standardized certifications and definitions for hydrogen’s origin and quality, differing safety and transport regulations, and infrastructure compatibility. Additionally, pricing mechanisms and contractual frameworks are still evolving, complicating market development. Geopolitical considerations and supply chain security also play significant roles, as hydrogen trade can shift energy dependencies. Harmonizing international standards, establishing transparent certification schemes, and developing robust transport infrastructure are critical steps to facilitate efficient and reliable hydrogen trade. Addressing these complexities is essential to unlock hydrogen’s full potential in global energy transition efforts.