| CACTUS | Canadian Association of Community Television Users and Stations 
| Others |
| CACTUS | Capital Area Central Texas Ultimate Society
| Others |
| CACTUS | Capital Area Central Texas Unix Society
| Others |
| CACTUS | Cold A** C*nts Talk Uterus Sh*t
| Others |
| CACTUS | Combined Adolescent Challenge Training Unit and Support
| Others |
| CACTUS | Community Action Council of Tulane University Students
| Others |
| CACTUS | Comprehensive Administration of Credentials for Teachers in Utah Schools
| Others |
| CACTUS | Converted Atmospheric Cherenkov Telescope Using Solar
| Others |