| NIFF | Naoussa International Film Festival 
| Others |
| NIFF | Naperville Independent Film Festival
| Others |
| NIFF | Naples International Film Festival
| Others |
| NIFF | Nashik International Film Festival
| Others |
| NIFF | National Inshore Fisheries Forum
| Others |
| NIFF | Nepal International Film Festival
| Others |
| NIFF | Network Interface Failure Finder
| Others |
| NIFF | Newark International Film Festival
| Others |
| NIFF | Niagara Integrated Film Festival
| Others |
| NIFF | Niigata International Film Festival
| Others |
| NIFF | Noida International Film Festival
| Others |
| NIFF | Noosa International Film Festival
| Others |
| NIFF | Nordic International Film Festival
| Others |
| NIFF | Nordisk Informasjonssenter For Flaggermus
| Others |
| NIFF | Northampton Independent Film Festival
| Others |
| NIFF | Northampton Inter Faith Forum
| Others |
| NIFF | Notation Interchange File Format
| Others |