| Acronym | Definition |
|---|
| OPALS➣Ontario Prehospital Advanced Life Support (study) |
| OPALS➣Ogren Plant Allergy Scale (Thomas Ogren) |
| OPALS➣Older People with Active Lifestyles (trademark of Dr. David J. Demko) |
| OPALS➣Optimized Portfolio As Listed Securities |
| OPALS➣Owain Phyfe Appreciative Listener Society (fan club) |
| OPALS➣Officer Projection Aggregate Level System |