A number of radar systems are now being developed for operation in the 100–1000 GHz frequency range. A few special-purpose radars are already in limited use in this region. This paper is a survey of radars at short millimetric wavelengths. The new IEEE Standard definition of radar and IEEE Standard letter designations for radar bands are presented with a note on the transitional nature of this frequency region. Possible radar applications and principal advantages of short millimetric wavelength radar are given. Technical characteristics of a number of representative civilian and military radars are given. It is shown that the characteristics of some of these radars are similar, but characteristics of other radars vary considerably. A discussion of future trends and issues concludes this survey paper.