| Acronym | Definition |
|---|
| TFN | Tax File Number (Australia) |
| TFN | Tribunal Fiscal de la Nación (Spanish: National Tax Court; Argentina) |
| TFN | TheForce.Net (Star Wars Fan Site) |
| TFN | Texas Freedom Network |
| TFN | Tsawwassen First Nation (Canada) |
| TFN | Transferrin (protein) |
| TFN | Today's Financial News (Baltimore, MD) |
| TFN | Transport File Name |
| TFN | Transverse File Name |
| TFN | Transfer File Name |
| TFN | Tax File Number |
| TFN | Tribe Flood Network |
| TFN | The Foundation (hip-hop band) |
| TFN | Taiwan Fixed Network |
| TFN | Tribe Flood Network (Computer virus TCPSYN flood, ICMP Echo and directed attacks) |
| TFN | The Food Network |
| TFN | Toronto FreeNet |
| TFN | Toll Free Number |
| TFN | The Freecycle Network (Freecycle Network, Inc.) |
| TFN | The Football Network (also seen as TFNK) |
| TFN | Thanks for Nothing |
| TFN | Third Frontier Network |
| TFN | Tour of Nilgiris (Indian bicycle tour) |
| TFN | Till Further Notice |
| TFN | Trochanteric Fixation Nail |
| TFN | Tobacco Free Nurses (Robert Wood Johnson Foundation) |
| TFN | Teach First Norway (educational project) |
| TFN | Tenerife, Canary Islands, Spain - Tenerife Norte Los Rodeos (Airport Code) |
| TFN | Toronto Field Naturalists (Canada) |
| TFN | Thomson Financial Network (website) |
| TFN | Track & Field News (periodical) |
| TFN | Thin Film Network |
| TFN | Third Floor North (Santa Ana, CA architectural sign company) |
| TFN | Thermoplastic Fixture Wire Nylon Jacketed (UL) |
| TFN | Trochanteric Femoral Nail |
| TFN | The Future Noise (monthly music exhibition) |
| TFN | Theoretical Foundations of Nursing (education) |
| TFN | Train Functional Number |
| TFN | Target File Number |
| TFN | Transnational Feminist Network |
| TFN | Trade Forums Noob (Star Wars Galaxies) |
| TFN | Total Frontal Nudity |
| TFN | Technique Française du Nettoyage SAS (France) |