The objective of the International Symposium on Feedstock Recycling of Polymeric Materials (ISFR) is to provide common platform for sharing the latest developments and exchange of ideas on the feedstock recycling of polymeric materials from both scientific and technological points of view. The current scenario of different processes for the valorization of polymeric residues (waste plastics, e-waste, marine plastic debris, biomass, etc.) by their transformation into raw chemicals, fuels, commercial products and/or energy using the thermo-chemical, catalytical, chemical and biochemical methods will be discussed. These methods are expected to be highly energy efficient and eco-friendly while providing an attractive profitability that may allow the modern societies to successfully manage the huge and increasing amounts of polymeric wastes. Moreover, the symposium is a great platform to establish new contacts for the future cooperation and present results of their research activities.