Resource efficient biomass feedstock supply is essential to sustain current capacities and facilitate market development for advanced bioenergy and biofuel technological pathways. The aim of the working paper is to: synthesize recent research targeting European biomass feedstock for bioenergy; identify opportunities and challenges and provide research and policy relevant recommendations for 2030 and beyond. Four research areas are analysed: improving practices for forest biomass supply and logistics; biofuels from marginal land; biomass supply and cost supply assessments and certification & standardization.