| CASO | Canada Southern Railway (Canadian Pacific Railway) 
| Others |
| CASO | Canadian Pacific Railway (CASO)
| Others |
| CASO | Cancellation Addendum Sales Order
| Others |
| CASO | Chicago Area Service Office
| Others |
| CASO | Chief Airport Security Officer
| Others |
| CASO | Chief Aviation Safety Officer
| Others |
| CASO | Civil Aviation Safety Officer
| Others |
| CASO | Club aquatique du Sud Ouest
| Others |
| CASO | Coalition of Advocates for Student Opportunities
| Others |
| CASO | College Adventist Student Organization
| Others |
| CASO | Computer Animation Studios of Ontario
| Others |
| CASO | Computer Animations Studios Of Ontario
| Others |
| CASO | Contemporary Art Sophisticate Ornaments
| Others |
| CASO | Contemporary Art Space Osaka
| Others |
| CASO | Contemporary Arts Sophisticate Ornament
| Others |
| CASO | Coordinators Association of Southwestern Ontario
| Others |
| CASO | Cordon & Search Operation
| Others |
| CASO | Cordon and satellite operations
| Others |
| CASO | Cordon And Search Operation
| Others |
| CASO | Cordon And Search Operations
| Others |
| CASO | Council of Arroyo Seco Organizations
| Others |
| CASO | Cultural and Area Studies Office
| Others |