THE JET AGE of today and the Space Age of tomorrow would not be possible without the recent developments in specialised lubricants that have increased the capabilities of fluids, greases, solid films, plastics, ceramics and other specialised lubricating agents. The present and potential use in aeronautical and astronautical flight have imposed and will continue to levy requirements upon lubricants that were beyond the vision or imagination of the lubrication expert of a decade ago. This article does not intend to create the illusion that all our problems have been solved. Rather, it is intended to present the new concepts and capabilities of some of the present products and the potential of the new developments on the basis of knowledge gained through both actual use and through research and development efforts.