The Ocean Multi-Use Toolkit is a comprehensive resource designed to support the integration of ocean multi-use (MU) within marine spatial planning (MSP) and associated policies. The Toolkit provides guidance and tools for policymakers, planners, stakeholders, and researchers to facilitate the sustainable development of ocean MU. The Toolkit chapters cover a wide range of topics related to MU developments, including policy, permitting, stakeholder engagement, technology, and business models and provide a comperhansive overview of relevant 'real-world' examples. The authors would like to extend their heartfelt gratitude to all the contributors to the Ocean Multi-Use Toolkit, whose unwavering dedication and invaluable contributions have played a pivotal role in shaping this comprehensive resource. Their insights, examples, and careful reviews have significantly enriched the content of the Toolkit. Special thanks to the extended MULTI-FRAME team: John Patrick Walsh, Peter Freeman - University of Rhode Island, Graduate School of Oceanography Coastal Resources Center; Abbey Greene, Claire Hodson - University of Rhode Island, Graduate School of Oceanography Coastal Resources Center and Rhode Island Sea Grant; Fredrik Grönhdahl- KTH Royal Institute of Technology; Josselin Guyot-Téphany - University of Nantes, Mariana Mata Lara - s.Pro; as well as to the external contributors Helena Calado - University of the Azores; Frank Maes, Marijn Rabaut - Ghent University; Eline Van Onselen - The Ritch North Sea; and Jacek Zaucha - Gdynia Maritime University. Heartfelt gratitude is also extended to the UNITED Horizon 2020 project partnership, which provided insights from its five real-world pilots, enriching and enhancing the comprehensiveness of this document. Their practical experience in offshore multi-use has been instrumental in shaping this resource.