| Acronym | Definition |
|---|
| TIN | There Is No ... |
| TIN | Turn In |
| TIN | Taxpayer Identification Number |
| TIN | Titanium Nitride |
| TIN | Tax Identification Number |
| TIN | Time Is Now (Song) |
| TIN | Triangulated Irregular Network |
| TIN | Theater Instituut Nederland (Dutch: Netherlands Theater Institute) |
| TIN | The Imperial Navy (Pardus Game) |
| TIN | Tubulointerstitial Nephritis |
| TIN | Tire Identification Number |
| TIN | Tax Information Number |
| TIN | Telecom Italia Net (Italian internet service provider) |
| TIN | Texas Innocence Network (University of Houston; Houston, TX) |
| TIN | Temporary Identification Number |
| TIN | Trader Identification Number |
| TIN | Testicular Intraepithelial Neoplasia |
| TIN | Traffic Information Network |
| TIN | Total Inorganic Nitrogen |
| TIN | The Iris Network (various organizations) |
| TIN | ThomasNet Industrial Newsroom (Internet news) |
| TIN | Telecentro de Informações e Negócios (Portugese, Brasil) |
| TIN | Tributary Identification Number (imports) |
| TIN | Terminal Indicate Number |
| TIN | Technical Interoperability Network |
| TIN | Tibet International Network |
| TIN | Tele-Electronic Identification Number |
| TIN | Task Implementation Notice |
| TIN | Tactical Intelligence Network (USFK specific) |
| TIN | Tracking Information Number |
| TIN | Threat Index Number |