Nuclear magnetic resonance (NMR) is one of the most versatile methods for studies of the behavior of hydrogen in materials. For metal – hydrogen systems and complex hydrides, this technique provides microscopic information of diverse nature, including the electronic properties, local structural features, and hydrogen dynamics. The present survey discusses the basic principles that make NMR useful for investigations of hydrogen in materials. Such a discussion is complemented by recent examples of application of this technique to studies of metal – hydrogen systems and complex hydrides. The emphasis is put on applications related to hydrogen mobility. The complementarity between NMR and quasielastic neutron scattering is also addressed.