These best practices guidelines have been developed and designed to inform and support both local and global Multi-Actor Laboratories (MALs), as stakeholder engagement processes within REWRITE (See also Stakeholder Engagement Plan), by showcasing exemplary approaches to social innovation in coastal rewilding. Based on a set of criteria, a substantial number of sites across Europe were selected as emblematic experiences and systematically investigated to extract lessons learned and identify specific forms of social innovation and stakeholder engagement. The resulting material contributes to the guidelines in two complementary ways: (1) by providing a comprehensive overview of the levels and methods of stakeholder participation employed in coastal rewilding initiatives, and (2) by identifying representative cases that are presented as detailed Case Studies. A total of 19 Case Studies are highlighted, with at least one case study for each thematic focus (Table 1). Following a concise overview of coastal rewilding practices and definitions, as well as an overview of past and ongoing projects implemented in Western Europe, the core structure of the guidelines is organized around three main entry points. First, the guidelines explore the spectrum of stakeholder engagement in decision-making, drawing on a simplified adaptation of Arnstein’s (1969) ladder of participation. This framework ranges from basic information dissemination and communication, through public consultation and stakeholder involvement, to stakeholder collaboration and, ultimately, stakeholder empowerment. Second, a dedicated section addresses participatory coastal rewilding, outlining four stages of the process: building a collective diagnostic, co-designing visions and co-planning rewilding scenarios, co-implementing projects and practices, and co-monitoring to guide adaptive management. An additional category is included to describe mechanisms that enable more permanent participatory processes, ensuring the continuity of rewilding initiatives over time. Third, the guidelines highlight the communication and valorization of the benefits of coastal rewilding, recognizing that effective messaging can enhance stakeholder engagement and incentivize participation. Five specific dimensions are examined in this context: reinforcing traditional cultures and local economies, promoting nature-based tourism, delivering educational programs, providing stakeholder training, and leveraging narratives and storytelling to foster broader understanding and support. Together, these three entry points provide a structured and practical framework for understanding, implementing, and sustaining socially inclusive coastal rewilding practices.