| Acronym | Meaning |
| FAT | Federate Acceptance Test |
| FAT | Field Acceptance Test |
| FAT | First Article Testing |
| FAT | Flight Acceptance Test |
| FAT | Flight Aptitude Test (aviation; UK) |
| FAT | Forces Armees Togolaises (French: Togolese Armed Forces) |
| FAT | Fugitive Apprehension Team (law enforcement) |
| FAT | Functional Acceptance Test(ing) |
| FAT | Functional Area Team |
| FAT | Funding Allowance Target (US Property and Fiscal Office) |