High‐Frequency Gravitational Wave (HFGW) generators are separated into three general categories. Precursor, component‐validation, laboratory experiments for each category except, possibly, the third are identified in general terms. The categories are: (1) The electromechanical category includes micro‐ and nano‐element, piezoelectric crystal, and multi‐dielectric film HFGW generators. (2) The high‐temperature superconductor category includesgasers, impressed magnetic fields, and transformation of electromagnetic radiation into gravitational waves (Gertsenshtein effect) HFGW generators. (3)The laser/plasma category includes laser‐energized mirrors, synchrotron light, nuclear fusion, plasma toroid, and nonlinear optical‐acoustical, molecular‐level HFGW generators. A perusal of HFGW literature reveals that since the 1960s many authors have contributed designs of mechanisms and devices that relate to the terrestrial generation of gravitational waves. Only in the last few years, however, have any researchers demonstrated that their proposed devices were practical HFGW generators, capable of producing kilowatts of power, that were operational in a laboratory setting. These recent devices make use of new technology and generate high‐frequency (GHz and above) gravitational waves using non‐gravitational forces. Most of the generators considered in this paper have been recently discussed at the May, 2003,Gravitational Wave Conferenceat The MITRE Corporation, McLean, VA, which was the very first International Conference dedicated to HFGW and attracted twenty‐five research papers from nine countries. Although no detailed experimental tasks are discussed, experimental test objectives in the form of a roadmap are proposed for each category. © 2004 American Institute of Physics