Synopsis : The Cryogenics and Test facilities Laboratory (LCSE), located at Saclay in the CEA (the French Atomic Energy and Alternative Energies Commission), has the expertise for designing, construction, integration and operating cryogenic installations in the domains of cryo-magnetism or pure cryogenics. This paper presents the several projects the LCSE is or has been involved over the last years in fundamental physics, fusion or medical science, its testing facilities and R&D projects.