The Fourth IAEA Technical Committee Meeting on Large Tokamak Experiments was held at Keidanren-Kaikan in Tokyo from 14 to 18 April, 1980. Previous meetings in this series had been held at Dubna, USSR, July 1975 [1]; Princeton, USA, November-December 1976 [2]; and Paris, France, September 1978 [3]. Eighty-five people attended the meeting, including 57 from Japan, 15 from the USA, three from the USSR, seven from Western Europe, and one from Canada.