SEAC

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 (1929–1961)
 * 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