| Acronym | Definition |
|---|
| QCA | Qualifications and Curriculum Authority (UK government) |
| QCA | Queensland College of Art (Australia) |
| QCA | Qt Cryptographic Architecture |
| QCA | Queens Council on the Arts (York) |
| QCA | Quantitative Coronary Angiography |
| QCA | Qualitative Comparative Analysis |
| QCA | Quebec Chaudiere-Appalaches (Canada) |
| QCA | Queensland Competition Authority (Australia) |
| QCA | Quantum-Dot Cellular Automata |
| QCA | Quoted Companies Alliance (UK) |
| QCA | Quantum Cellular Automata |
| QCA | Queen City Angels (Cincinnati, OH) |
| QCA | Quebec Court of Appeal (Canada) |
| QCA | Quasi-Crystalline Approximation |
| QCA | Quiet Communities Act |
| QCA | Quinte Construction Association (Ontario, Canada) |
| QCA | Quality Control Analyst |
| QCA | Quality Control Analysis |
| QCA | Quality Compliance Assurance |
| QCA | Quick Connect Acknowledge |
| QCA | Quasi-Cyclic Abelian (code) |
| QCA | Quebec Construction Association |
| QCA | Quadrifilar-Curl Antenna |