Nanophotonics is an internationally vibrant research field, which combines the latest research advances in enhanced light‐matter interactions in nanoscale structures with advanced engineering tools, spanning over a broad range of applications from optical computing to sensing and detection. The use of nanostructures for generating, detecting, and manipulating light has been opening a plethora of new applications in terms of sensing, flat lenses, compact light sources, optical interconnects and so on. At the same time, the current research in nanophotonics has been hindered by the impact of material loss, as light is squeezed in smaller and smaller structures, enhanced light‐matter interactions also imply enhanced material absorption. This special issue covers the growing area of active nanophotonics, based on which nanoscale devices are integrated with active materials, enabling loss compensation, nanoscale lasers and unusual optical responses. Active devices such as laser sources, photodetectors, modulators also allow for active manipulation of light, not limited to passive operations like propagation of light through an optical waveguide or an optical fiber.