International fusion regulation harmonization is overviewed through practices, technical capabilities, and future plans. As global momentum towards fusion energy accelerates, this publication provides a timely and important overview of the international fusion regulatory landscape. It addresses the need for robust and harmonized frameworks by documenting the practices, technical capabilities, and future plans of IAEA Member States. Drawing on a wealth of experience from fusion facilities worldwide, this document identifies common regulatory issues and proposes key priority areas for consideration of the development of new national regulations. Designed for regulatory bodies, policymakers, and fusion industry stakeholders, this publication serves as a valuable resource to enhance regulatory preparedness. By fostering international awareness and collaboration, it supports the establishment of clear and effective frameworks, ultimately facilitating the safe, secure, and efficient global deployment of fusion energy.