| Acronym | Definition |
|---|
| TN | Tennessee (US postal abbreviation) |
| TN | Ton |
| TN | True North |
| TN | Town |
| TN | Train |
| TN | Technical Note |
| TN | Tonga |
| TN | Trade Name |
| TN | Telephone Number |
| TN | Tunisia (ISO country code, top level domain) |
| TN | Total Nitrogen |
| TN | Trento (Trentino Alto Adige, Italy) |
| TN | Telnet |
| TN | Tamil Nadu (state in India) |
| TN | Traveler's Notebook |
| TN | Teilnehmer (German: Participant) |
| TN | Transaction Number |
| TN | Terranova |
| TN | Twisted Nematic |
| TN | Transposon |
| TN | Air Tahiti Nui (airline code) |
| TN | Ted Nugent (rock artist) |
| TN | Trigeminal Neuralgia |
| TN | Tonbridge (postcode, United Kingdom) |
| TN | Trade NAFTA |
| TN | Thermonuclear |
| TN | Tech Net |
| TN | Target Number (gaming) |
| TN | Tech N9ne (rapper) |
| TN | True Negative |
| TN | Track Number |
| TN | Tele Noticias (Spanish: Tele News; Argentina) |
| TN | Tree Nut |
| TN | Terminal Number |
| TN | Thoron (Thorium emanation) |
| TN | Tomato Nation (advice column) |
| TN | True Neutral (gaming) |
| TN | Tracor Northern |
| TN | Transneft (Russian oil transportation and pipeline construction company) |
| TN | Terra Nuova |
| TN | Tipperary North (Ireland) |
| TN | Tubular Nylon |
| TN | Transport Node |
| TN | Thomson Newspapers |
| TN | Theoretical Novelty (Chess) |
| TN | Track Newsletter (periodical) |
| TN | Translators Notes |
| TN | TDRSS Network |
| TN | Thermoplastic Nitrile |
| TN | Traction Norvège (Norwegian automobile club) |
| TN | Technonikol Ltd. (building systems producing and distributing) |
| TN | TASDAC Node |