"The Central Europe Leaders in Bioeconomy (CELEBio) project aimed at strengthening Bioeconomy-related activities in Bulgaria, Czech Republic, Croatia, Hungary, Slovak Republic and Slovenia through the assessment of sustainable biomass availability, the mapping of actors along biobased economy value chains, the elaboration of evidence-based Action Plans. CELEBio, therefore, elaborated reports that include (a) comprehensive overviews of the countries, (b) detailed descriptions and quantification of sustainable biomass from agriculture, forestry, transformation industry and waste streams, including their current uses and untapped potentials; (c) overviews of the bio-based industries and market, with an outlook towards future biomass valorisation options; (d) descriptions of related infrastructures, logistics and energy assets; (e) insights into the innovation potential and research capacities; (f) detailed policy assessments, with information about financing options. To enhance the (macro-) regional outlook, similar studies have been performed for Albania, Bosnia and Herzegovina, Greece, Serbia, Montenegro and North Macedonia. CELEBio performed a detailed analysis of each target country's bioeconomy landscape to develop stakeholders' exhaustive databases along bio-based value chains. This information will prove essential for any further mobilisation effort and strategic planning and investments. CELEBio also elaborated six specific, measurable, attainable, relevant, and time-based guidelines for National Action Plans, and one similar regional scope report. Each National Action Plan includes a statement on the current level of development of the country's bioeconomy, an analysis of comparative advantages, an assessment of the policy framework and a Vision for future growth. An implementation plan with specific goals upholds the Vision. Moreover, CELEBio successfully set-up the network of ""BBI Ambassadors"". Finally, CELEBio elaborated six National Bioeconomy Dossiers to support further dissemination and mobilisation in target countries. Each of them includes the analytical report, the stakeholders mapping and the policy guidelines, thus allowing the reader having access to an exhaustive, yet handy, analysis of the strengths, weaknesses and opportunities of a specific territory. The National Bioeconomy Dossiers represent a tangible heritage and, owing to their completeness and overall quality, a cornerstone of the future bio-based industry in the CELEBio region."