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Nature-Based Solutions (NbS) are increasingly recognised as essential instruments for achieving the targets of the EU Nature Restoration Law (Regulation 2024/1991), the EU Biodiversity Strategy 2030, and the Kunming-Montreal Global Biodiversity Framework. However, despite robust scientific evidence of their effectiveness, NbS systematically fail to transition from pilot demonstrations to mainstream policy and investment practice. A growing body of literature identifies governance fragmentation and inadequate multi-actor coordination as primary barriers to this scaling failure. This technical report presents the Multi-Actor Governance (MAG) Framework, a methodological toolkit designed to address this deficit by operationalising participatory governance for NbS mainstreaming. The framework integrates four interconnected pillars: stakeholder ecosystem mapping, structured engagement protocols, Living Lab implementation methodology, and policy brief co-production workflows. Developed through applied research in Mediterranean contexts — including water management, agricultural landscape restoration, and urban green infrastructure — the MAG Framework provides practitioners, local authorities, and research consortia with replicable protocols for embedding multi-actor governance into NbS planning, implementation, and policy integration cycles. The toolkit is aligned with the IUCN Global Standard for NbS (2nd edition, 2023), specifically Criteria 5 (Inclusive Governance) and 7 (Adaptive Management), and designed for deployment within Horizon Europe research and innovation projects requiring structural SSH integration