| ACEC | Ada Compiler Evaluation Capability 
| Others |
| ACEC | Advisory Committee on Electromagnetic Compatibility
| Others |
| ACEC | American Consulting Engineers Council
| Others |
| ACEC | American Council of Engineering Companies
| Others |
| ACEC | Animal Care and Ethics Committee
| Others |
| ACEC | Arab Commission for Education and Communication
| Others |
| ACEC | Area of Critical Environmental Concern
| Others |
| ACEC | Areas of Critical Environmental Concern
| Others |
| ACEC | Aridi Contracting and Engineering Company
| Others |
| ACEC | Arizona Council for Economic Conversion
| Others |
| ACEC | Association of Consulting Engineers of Canada
| Others |
| ACEC | Atelier de Constructions Electriques de Charleroi
| Others |
| ACEC | Ateliers de Constructions Electriques de Charleroi
| Others |
| ACEC | Australian Computers in Education Conference
| Others |
| ACEC | Autism Centers of Excellence Program
| Others |
| ACEC | Automotive Components Engineering Centre
| Others |