The book "Field Emission Electronics" focuses on a promising area at the intersection of classical vacuum electronics and nanotechnology. It provides a comprehensive analysis of theoretical models and includes detailed descriptions of experimental and research-related techniques, as well as production technologies for various types of field emitters based on different construction principles. A particular emphasis is placed on the research and production of field cathodes and electron guns using newly developed nanomaterials and carbon nanotubes. Additionally, the applications of field emission cathodes in new technologies such as light sources, flat screens, and microwave and X-ray devices are discussed.