| Acronym | Definition |
|---|
| ATCA | Alien Tort Claims Act |
| ATCA | Adelaide Turf Cricket Association (Australia) |
| ATCA | Advanced Telecom Computing Architecture |
| ATCA | Advanced Telecom Computing Architecture (also AdvancedTCA) |
| ATCA | Alaska Tobacco Control Alliance |
| ATCA | Air Traffic Controllers Association |
| ATCA | Antique Telephone Collectors Association |
| ATCA | Airline Training Center Arizona (Phoenix, AZ) |
| ATCA | Aisin Technical Center of America (Northville, MI) |
| ATCA | Advanced Tanker Cargo Aircraft |
| ATCA | Allied Tactical Communications Agency |
| ATCA | Australian Telescope Compact Array |
| ATCA | Air Traffic Control Assistant |
| ATCA | Airedale Terrier Club of America, Inc. |
| ATCA | Advance Thin Capitalisation Agreement (UK) |
| ATCA | Airedale Terrier Club Argentino (Brazil) |
| ATCA | Alarm Threshold Crossing Alert |
| ATCA | American Telephone Collectors Association (University of Michigan) |