Radio networks provide users the attractive feature of untethered connectivity for a range of applications including cellular communications, wireless local area data networks, and broadband fixed wireless access. The application of optical fiber in these networks for the transport and distribution of radio signals brings a number of benefits, including high-performance remoting links and reduced infrastructure costs. In this chapter, we present an overview of hybrid fiber radio systems with a focus on the basic enabling technologies and concepts for such systems, including signal transport schemes and network architectures. We also discuss the technical challenges and potential solutions associated with implementing hybrid fiber radio systems operating at higher frequencies and review the current prospects for their practical realization.