| Acronym | Definition |
|---|
| FLASH | Federal Alliance for Safe Homes |
| FLASH | Florida Alliance for Safe Homes |
| FLASH | Fast Low-Latency Access with Seamless Handoff (Flarion Technologies) |
| FLASH | Family Life and Sexual Health |
| FLASH | Fast Low Angle Shot |
| FLASH | Fast Locating and Special Handling (service parts; John Deere) |
| FLASH | Free Electron Laser in Hamburg |
| FLASH | Fastest Legal All Street Harleys |
| FLASH | FLAMES Scenario Highlighter |
| FLASH | Film Location and Sales Heartbeat (Nielsen EDI) |
| FLASH | Folding Lightweight Active Sonar for Helicopters |
| FLASH | Fun Leisure Access Savings and Health (City of Seattle Washington) |
| FLASH | Families Learning to Advocate with Support and Help |