The advancement of nanotechnology has enabled unprecedented manipulation of nanophotonics, plasmonics, metasurfaces and their applications. This session focuses on the fundamental physics and numerical modeling of light-matter interaction in practical nanophotonics, plasmonics, and metastructures, leading to the enhanced performance metrics and new applications of metamaterials, metasurfaces, metallic and dielectric nanoantennas, and plasmonic nanostructures. Example topics include light-matter interaction in strong coupling regime, nonlinear optics in nanophotonics, plasmonics metasurfaces, metamaterials, novel optical devices, polariton lasers, single-photon sources, light-emitting metasurfaces, 2D materials nanostructures, topological materials, quantum plasmonics, random lasers, lasing spasers, metalens and optical imaging, etc.