| Acronym | Definition |
|---|
| HWSA➣Heads of Workplace Safety Authorities (New South Wales, Australia) |
| HWSA➣Homeschool World Series Association (est. 2000) |
| HWSA➣Hazardous Waste Storage Area |
| HWSA➣Houston Women's Soccer Association |
| HWSA➣Hazardous Waste Services Association |
| HWSA➣Hickory Willow Swim Association |