The integration of 3D and 4D printing technologies with polymer nanocomposites has emerged as a promising approach for fabricating advanced electronic devices. This typical chapter thoroughly investigates the essential elements, processing factors, and different applications of 3D and 4D printed electrically conductive polymer composites. The electrical characteristics of these materials are mainly determined by the establishment of conductive networks within the polymer matrix, which may be meticulously regulated by the judicious selection of filler materials, optimization of processing conditions, and advanced printing techniques. The integration of diverse conductive fillers, such as carbon nanotubes, graphene, and metallic nanoparticles, allows the development of materials with adjustable electrical conductivity, spanning from antistatic to extremely conductive formulations. Furthermore, the advent of 4D printing provides temporal and stimuli-responsive electrical characteristics, broadening the potential applications in intelligent electronics and adaptive systems. Despite substantial advancements in comprehending and regulating the electrical characteristics of printed polymer composites, difficulties persist in attaining uniform performance, enduring stability, and scalable production. This analysis highlights recent advancements, existing problems, and prospective prospects in this swiftly progressing domain, with a specific focus on applications in flexible electronics, biomedical electronic interfaces, and energy storage & conversion.