Recent progress on materials for hydrogen storage have pointed out that kinetics and thermodynamics can be modified by nano-confinement of hydrides in porous scaffolds. The investigation of the structural features of these particular systems is challenging with conventional methods, for instance due to the lack of peaks in the diffraction pattern. Small angle neutron scattering is suitable for studying porous systems containing hydrogen and it has been invaluable for the characterisation of the new hydride systems. This chapter presents the basic principles of the technique and gives examples of its application to the field of nano-confined materials for hydrogen storage.