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