| CATT | calcium tolerance test 
| Others |
| CATT | card agglutination test for Trypanosomiasis
| Others |
| CATT | Carolina Anglers Team Trail
| Others |
| CATT | Cattclearwater Accountability Treatment Team
| Others |
| CATT | Center for Advanced Technology in Telecommunications
| Others |
| CATT | Center for Advanced Transportation Technology
| Others |
| CATT | Center for Aquatic Technology Transfer
| Others |
| CATT | Centre for Advancement of Trenchless Technologies
| Others |
| CATT | Centre for Advancement of Trenchless Technology
| Others |
| CATT | Centre for the Advancement of Trenchless Technology
| Others |
| CATT | Chemicals Agitation Temperature And Time
| Others |
| CATT | Chicago Area Tiki Tour
| Others |
| CATT | China Academy of Telecommunication Technology
| Others |
| CATT | Clinical Assessment, Tracking, and Triage
| Others |
| CATT | College Advisory Training Team
| Others |
| CATT | Combined Arms Tactical Trainer
| Others |
| CATT | Combined Arms Tactical Trainers
| Others |
| CATT | Comparison of age-related macular degeneration treatments trials
| Others |
| CATT | Comparison of AMD Treatments Trials
| Others |
| CATT | Computer Aided Test Tool
| Others |
| CATT | Computer And Technologies Theme
| Others |
| CATT | Computer And Technology Theme
| Others |
| CATT | Computer Assisted Teacher Training
| Others |
| CATT | Computer Assisted Technology Transfer
| Others |
| CATT | Computer-Aided Test Tool
| Others |
| CATT | Concussion Awareness Training Toolkit
| Others |
| CATT | Contractors Association of Truckee Tahoe
| Others |
| CATT | Customs Assessment Trade Toolkit
| Others |