Submit your unpublished research on any aspect of electrical discharge machining (EDM) to this Special Issue. Electrical discharge machining (EDM) is one of earliest and most widely used nontraditional machining processes commonly used to machine difficult-to-cut materials. For the capability of machining materials irrespective of their hardness, EDM has found important applications in automotive, electronic, packaging, telecommunication, aerospace, and biomedical industries. Although die-sinker EDM and wire-EDM are two major types of EDM, there has been continuous research on the development of varieties of EDM at multiscales using these two major EDM types. Some of the recent developments are micro-EDM drilling, micro-EDM milling, orbital micro-EDM, and nanoscale EDM. Another recent expansion in the EDM research is the development of EDM-based hybrid machining processes, where another machining process is used either simultaneously or sequentially with EDM to alleviate the shortcomings of the EDM process. Some of the examples of EDM-based hybrid processes are powder-mixed EDM, vibration-assisted EDM, laser-assisted EDM, electrochemical discharge machining (ECDM), etc. The goal of this Special Issue is to comprehend significant studies and recent advances in the areas of multiscale EDM and EDM-based hybrid machining processes. Experimental investigation, analytical modeling, and numerical simulations in the areas of EDM and EDM-based hybrid processes are of interest. Process development, monitoring, and control of various macro- and microscale EDM-based processes fall within the scope of this Special Issue. Specific topics of interest include but are not limited to: Multiscale EDM processes, i.e., conventional EDM, micro-EDM, nano-EDM; Die-sinker and wire-EDM processes; Variations of EDM, i.e., micro-EDM drilling, micro-EDM milling, orbital EDM, Reverse EDM, dry EDM, etc.; EDM-based hybrid processes, or assisted EDM processes, i.e., vibration-assisted EDM, laser-assisted EDM, powder-mixed EDM, etc.; EDM of difficult-to-cut, newer and novel materials; EDM for innovative applications, such as biomedical implants; EDM process development, monitoring, and control; Optimization of EDM processes.