| Acronym | Definition |
|---|
| TWI | Twilight |
| TWI | Tread Wear Indicator (tires) |
| TWI | The Welding Institute |
| TWI | Texting While Intoxicated |
| TWI | Tread Wear Indicator |
| TWI | Trade Weighted Index |
| TWI | Two Wire Interface |
| TWI | The Way International (Christian ministry) |
| TWI | Two-Way Immersion |
| TWI | Training With Industry |
| TWI | Terlato Wines International (Lake Bluff, IL) |
| TWI | Trans World International |
| TWI | Through Wafer Interconnect (circuits) |
| TWI | Typing While Intoxicated |
| TWI | The Washington Independent |
| TWI | T Wave Inversion (electrocardiography) |
| TWI | The Writing Instructor (journal) |
| TWI | The Workplace, Inc. (Bridgeport, CT) |
| TWI | Totally with It |
| TWI | Toegepaste Wetenschappen Interactief (Dutch: Applied Interactive Sciences; Belgium) |
| TWI | Threat Warning Indicator |
| TWI | Time Warner Interactive, Inc. |
| TWI | Tactical Weather Intelligence |
| TWI | Two-Way Interface |
| TWI | Tire Wear Indicator |
| TWI | Temporary Work Instruction (Australia) |