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The Italian coastal and marine space includes areas with remarkable differences in terms of oceanographic characteristics, maritime uses, natural habitats, species distribution, landscape and cultural heritage. In Italy, coastal and marine management competencies are shared among national, regional, and for some aspects even local authorities. This geographic heterogeneity and governance complexity required the adoption of a multi-scalar approach to Maritime Spatial Planning (MSP). Such an approach aims at implementing decision-making and spatial planning at multiple and nested scales. In the case of Italy, the multi-scalar approach included the definition of national guidelines and the development of three maritime spatial (MS) plans, one for each maritime area (Adriatic, Ionian and Central Mediterranean, and Tyrrhenian and Western Mediterranean), including subareas and nested planning units. The development of the MS plans involved competent Ministries, the coastal Regions and several researchers. Based on the description of the adopted six-phase methodology and the exemplification of results of the Italian MSP process, this paper discusses the most relevant features and common challenges of multi-scalar MSP (i.e. co-planning, vertical and horizontal integration, multi-level governance, scalability, flexibility, integration of data and knowledge with different resolution, multi-scalar stakeholder engagement). Finally, the paper reflects on some novel aspects of the adopted multi-scalar approach and identifies actions to grant efficacy to this approach during the next phases of the Italian MSP process. [ABSTRACT FROM AUTHOR]