The course is simply composed of four main parts. In the first part, fundamentals of wireless communications along with the link budget calculations are covered. In the second one, mm- Wave and THz CMOS transceivers are introduced for ultra-high data-rate wireless systems, phased arrays, and THz radiators (THz Transmitters). Following to this part, active and passive devices on CMOS for millimeter-wave and THz circuits are introduced. In this part, characterization of these devices and modeling are covered as well as calibration and de-embedding methods for device measurements. In the final part, design of some millimeter-wave and THz circuits are explained.