Photonics, the science of photon, encompasses the generation, amplification, transmission, detection, manipulation of photons. Photonics is becoming more and more prevalent in our society and in a growing number of sectors of industrial activity. The aim of the action “Photonics 4 Society” is to develop in the Hauts de France region an ecosystem around photonics using optical fibres. It will integrate a continuum of activities ranging from basic and applied research, which drives innovation, to the development, demonstration and qualification of new solutions. Photonics 4 Society offers research and development directions identified in H2020. This action, focusing on industrial leadership in ICT and health, builds on key generic technology “Photonics” and places an important place on innovation in SMEs. The project has two components: a first strand focused on basic and applied research and the second on the creation of the innovation and development platform “Fibertech Lille”, joint laboratories and startups. The first part is structured in 3 axes. The first axis is dedicated to Photon-Material and Photon-Vivant couplings: it is naturally based on the “mathematics-physics-biology” collaborations between Painlevé and PhLAM laboratories within the framework of LABEX CEMPI. The second axis explores two directions: the communi