SEAC may refer to:
SEAC (computer), a first-generation electronic computer built in 1950 Senior Enlisted Advisor to the Chairman, an advisor to the United States Joint Chiefs of Staff Senior Enlisted Advisor to the Chiefs of Staff Committee, the senior other ranks advisor of to the British Chiefs of Staff Committee SESAR European Airports Consortium, a participant in the reform of the fragmented European air traffic management system The Society for Electroanalytical Chemistry Society for Ethics Across the Curriculum South East Asia Command, a World War II Allied military command South East Atlantic Conference Southeastern Athletic Conference, an intercollegiate athletic conference of historically black colleges and universities in the United States Student Environmental Action Coalition, a coalition of environmental groups in the United States and Canada Radio SEAC, see Sri Lanka Broadcasting Corporation South Eastern Agricultural College, later Wye College