In this tutorial, ESD protection in radio frequency (RF) technologies is discussed. The tutorial covers ESD protection in RF CMOS, BiCMOS silicon germanium, gallium arsenide, and RF silicon-on-insulator (SOI). The tutorial will focus on device physics, technology, ESD layout design, ESD circuits and design systems. Also, HBM, MM, and TLP measurements of RF ESD technologies and RF circuits will be shown.