The COST Action NanoSpectroscopy aims at gathering European expertise in order to further develop UV/Vis/NIR/Raman nanospectroscopic techniques and modelling with (ultra-)high spatial, temporal, and spectral resolution and sensitivity, and the application of these techniques to novel (hybrid) (in)organic nanomaterials, complex device structures, and biosystems. The synergistic efforts in the interdisciplinary environment of the Action promise rapid progress in designing new nanospectroscopic techniques, further technical development of established techniques (e.g. towards non-specialist user-friendly setups), theoretical understanding and data processing, basic knowledge of light-matter interaction and energy flow at the nanoscale, and a boost in the manipulation of complex nanosystems, to be made available to societal needs.