Over the past few years, there has been a tremendous revival of interest in airships. This seems to occur about every ten years, but what has surprised many is the duration and magnitude of the current wave of enthusiasm. In the early 70s, several articles were published emphasizing the airship's low noise and pollution and its potential for utilizing relatively undeveloped and inexpensive landing sites. Because aircraft noise and airport expansion were major issues at the time, many environmentalists added their support to the usual cadre of ex-airshipmen and aviation enthusiasts advocating airship revival. The energy crisis and the airship's fuel efficiency gave additional impetus to the movement, attracting more conservative elements of industry and government. Simultaneous with renewed interest in the United States, several design projects were started in England, France, Germany and Canada, sponsored by such reputable firms as Shell International. A German firm has built several small airships recently and a Canadian airship will be flown within the year. A British group has flown a small recreational vehicle. Even the Soviet press announced design studies in progress in the USSR. Add to these conditions a number of both vocal and articulate advocates and what might have been another brief period of popular interest has become a major topic of discussion. As a result, the United States Government is re-examining airships. The Senate Committee on Aeronautical and Space Sciences heard several LTA presentations during its hearings on Advanced Aeronautical Concepts. The Naval Air Development Center at Warminster, Pennsylvania, has begun an inhouse study of current technology that could be applied to lighter than air. The National Aeronautics and Space Administration's Ames Research Center recently awarded two study contracts to analyze LTA concepts. To focus these activities, NASA, the Navy, the United States Department of Transportation and the Federal Aviation Administration sponsored a one-week workshop on lighter than air. This program, organized and directed by the MIT Flight Transportation Laboratory, is documented in this report and FTL Report 75-2, Proceedings of the Interagency Workshop on Lighter Than Air Vehicles.