| Acronym | Definition |
|---|
| MRCA | Most Recent Common Ancestor |
| MRCA | Midwest Roofing Contractors Association |
| MRCA | Multi-Role Combat Aircraft |
| MRCA | Mountains Recreation and Conservation Authority (California) |
| MRCA | Market Research Corporation of America |
| MRCA | Member of the Royal College of Anaesthetists |
| MRCA | Malaysian Retailer-Chains Association |
| MRCA | Medical Refresher Courses for Afghans |
| MRCA | Military Radio Collectors Association |
| MRCA | Missouri Rodeo Cowboys Association |
| MRCA | Motorcycle Riders Club Of America (website) |
| MRCA | Medium Resolution Coverage Area |
| MRCA | Manitoba Recreational Canoeing Association, Inc. (Canada) |
| MRCA | Manager of Radiological Consequence Assessment (nuclear) |