This guidebook was created in an attempt to organize less-than-lethal weapons references into specific weaponry/technology and organizational/conceptual categories and serves as a training and education tool for law enforcement and public policing practitioners, as well as researchers. The guide is divided into two major open-source sections. The first section is a detailed listing of the weaponry/technology and organizational/conceptual categories. Within weaponry/technology, a functions-based approach is taken initially with categories arranged into personnel protection, custody and transport, marking and tracking, and denial devices and barriers. Then, a weaponry-based approach is taken with categories into sprays and agents, kinetic devices, electrical devices, acoustical devices, radio frequency/HPM devices, psycho-technology, optical devices, and multi-sensory devices. Organizational/conceptual categories include: U.S. governmental agencies and groups, allied coalitions and nations, opposing forces (OPFORs), and criminals, conflict environments, concepts, and supportive resources. The second section of the guide provides a detailed author reference listing.