NIFF
| Acronym | Definition |
|---|---|
| NIFF | Northampton Independent Film Festival (Massachusetts) |
| NIFF | Newport International Film Festival (est. 1998; Newport, RI) |
| NIFF | Notation Interchange File Format |
| NIFF | Naples International Film Festival (Naples, FL) |
| NIFF | Navy Image File Format |
| NIFF | Network Interface Failure Finder (UNIX) |