| MACI | Mandel Atletiek Club Izegem 
| Others |
| MACI | Maori Arts and Crafts Institute
| Others |
| MACI | Massachusetts Association for the Chemically Injured
| Others |
| MACI | Master of Arts in Curriculum and Instruction
| Others |
| MACI | Matrix Associated Chondrocyte Implantation
| Others |
| MACI | Matrix-Induced Chondrocyte Implantation
| Others |
| MACI | Michigan Automotive Compressor Inc
| Others |
| MACI | Michigan Automotive Compressor Inc.
| Others |
| MACI | Michigan Automotive Compressor, Inc.
| Others |
| MACI | Military Adaptation of Commercial Items
| Others |
| MACI | Millon Adolescent Clinical Inventory
| Others |
| MACI | Model Aeronautics Council of Ireland
| Others |
| MACI | Monitor, Access, and Control Interface
| Others |
| MACI | Montana Alliance for Citizen Information
| Others |
| MACI | Multi Account Copier for Investors
| Others |
| MACI | Multimedia Advanced Computational Infrastructure
| Others |
| MACI | Multiple Access Cryptographic Interface
| Others |