MWSCAS 2023 is the IEEE 66th International Midwest Symposium on Circuits and Systems that will be held from August 6-9, 2023, at Phoenix, Arizona, USA. It is the North American flagship conference of the IEEE Circuits and Systems (CAS) Society and a premiere forum for researchers in the active fields of theory, design, and implementation of circuits and systems. This is accomplished through technical conference sessions, poster sessions, and publication of conference papers. MWSCAS 2023 embraces the theme of Reinventing Microelectronics to explore the potential of circuits and systems to address societal challenges through microelectronics design and manufacturing.