On November 30, the University Institute of Engineering Research of Aragon (I3A) hosted the first meeting of the Spanish Network of Sustainable Biorefineries (BioSos) funded by the Ministry of Science, Innovation and Universities (RED2022-134457-T). The BioSos Network is made up of 14 research groups from different Spanish Universities and a Group from the ITQ (CSIC-UPV) that work in different areas related to the biomass biorefinery such as fractionation processes, the valorization of components, thermochemical biorefinery, catalyst design, process simulation and optimization, and life cycle analysis.