- ACEC stands for American Council of Engineering Companies (formerly American Consulting Engineers Council)
- ACEC stands for American Consulting Engineers Council (now American Council of Engineering Companies)
- ACEC stands for Areas of Critical Environmental Concern
- ACEC stands for Association of Corporate Executive Coaches
- ACEC stands for Association of Consulting Engineers of Canada
- ACEC stands for Adams Columbia Electric Cooperative (Wisconsin)
- ACEC stands for Advisory Commission on Electronic Commerce
- ACEC stands for Associazione Cattolica Esercenti Cinema
- ACEC stands for Association of Canadian Editorial Cartoonists (est. 1988)
- ACEC stands for Advisory Committee on Electromagnetic Compatibility (International Electrotechnical Commission; Switzerland)
- ACEC stands for Army Communications Electronics Command (now CECOM)
- ACEC stands for Australian Council of Education Centres
- ACEC stands for Ada Compiler Evaluation Capability
- ACEC stands for Armenian Cultural and Educational Center (Watertown, Massachusetts)
- ACEC stands for Acute Critical Effluent Concentration
- ACEC stands for Association Canadienne d’études Cinématographiques
- ACEC stands for Association Canadienne d’études Cinématographiques (Film Studies Association of Canada)
- ACEC stands for Assessment Component of Employment Counselling
- ACEC stands for Alcona County Environmental Coalition (Alcona County, MI)
- ACEC stands for Association Chouala pour l’Education et Culture (Morocco)
ACEC