| ACTI | Abstract and Concrete Templates and Instances 
| Others |
| ACTI | Academy of Catholic Thought and Imagination
| Others |
| ACTI | Advanced Cleanup Technologies Inc
| Others |
| ACTI | Advanced Computational Technology Initiative
| Others |
| ACTI | Africa Christian Training Institute
| Others |
| ACTI | American Combustion Technology Industry
| Others |
| ACTI | Angeles Composite Technologies Inc
| Others |
| ACTI | Arkansas Career Training Institute
| Others |
| ACTI | Assetto Corsa Telemetry Interface
| Others |
| ACTI | Association of Caribbean Tertiary Institutions
| Others |
| ACTI | Automated Computer Telephone Interviewing
| Others |