The Proceedings of the 5th China and International Young Scientist Terahertz Conference highlight important research and technological progresses on terahertz sensors, terahertz detection, terahertz biophysics and bioeffects, terahertz signal sources, terahertz transmission and regulation, terahertz device and materials, terahertz communication, terahertz radar and imaging, and the intersection and application of terahertz-related disciplines.