| Acronym | Definition |
|---|
| FISH | Fluorescence In Situ Hybridization (genetics test) |
| FISH | Fluoreszenz-in-Situ Hybridisierung (nucleic acids) |
| FISH | Federazione Italiana per il Superamento dell Handicap |
| FISH | Flash Internal Semiconductor Harddrive |
| FISH | First In Still Here |
| FISH | Friends of the Issaquah Salmon Hatchery |
| FISH | Friends in Service Helping |
| FISH | Fighting in Someone's House (NATO/British Army) |
| FISH | Fresh Ideas Start Here |
| FISH | Forensic Information System for Handwriting |
| FISH | Forensic Information Scanning Hub (criminal investigation software) |
| FISH | Fellowship in Someone's Home |
| FISH | Fibonacci Shrinking Generator (cryptography) |
| FISH | Fellowship in School Hours |
| FISH | Forget It Stuff Happens (polite form) |
| FISH | First I Seek Him (Maranatha Academy) |
| FISH | Friends in Service for Him |
| FISH | Foundation for Science and the Handicapped, Inc. |
| FISH | Fish Information Services Haddington |
| FISH | Foundation for Indian Scientific Heritage (India) |
| FISH | Free Info on Student Health |
| FISH | Families Invested Support Health |
| FISH | Fortified Irish Small House |