ACEC

ACEC may refer to:


 * Advisory Committee on Electromagnetic Compatibility, a branch of the International Electrotechnical Commission
 * American Council of Engineering Companies, a representative of America's engineering industry
 * Area of Critical Environmental Concern, a program managed by the Bureau of Land Management
 * Area of Critical Environmental Concern (Massachusetts), a state level land protection program in Massachusetts
 * Australian Computers in Education Conference, a conference held by the Australian Council for Computers in Education every two years
 * SA Ateliers de Constructions Electriques de Charleroi, Belgian electrical engineering company founded in 1904, defunct 1989