| Acronym | Definition |
|---|
| TDI | Texas Department of Insurance |
| TDI | Total Drama Island (animated reality TV show) |
| TDI | Temporary Disability Insurance |
| TDI | Turbo Direct Injection |
| TDI | Tax(payer) Delinquency Investigation |
| TDI | Time Delay Integration |
| TDI | Technology Development and Innovation |
| TDI | Tissue Doppler Imaging |
| TDI | The Devil Inside (film) |
| TDI | Turbocharged Direct Injection (trademark of Volkswagen) |
| TDI | Tolerable Daily Intake (contaminant intake limit) |
| TDI | The Development Initiative (various locations) |
| TDI | Tear Down Inspection |
| TDI | Therapy Development Institute (Cambridge, MA) |
| TDI | Treatment Demand Indicator (drug addiction: various locations) |
| TDI | Test Data Input |
| TDI | Tire Defect Indicator |
| TDI | Trade Data Interchange |
| TDI | Turbo Diesel Intercooler |
| TDI | Turbo Diesel Injection |
| TDI | Technical Diving International |
| TDI | Time-Delay & Integration |
| TDI | Transport Driver Interface |
| TDI | Test Data In |
| TDI | Tivoli Directory Integrator |
| TDI | Tourism Development International (various locations) |
| TDI | Telecommunications for the Deaf, Inc. |
| TDI | Toluenediisocyanate (component of many polyurethanes) |
| TDI | Tabbed Document Interface |
| TDI | Therapy Dogs International, Inc |
| TDI | Time Delay Interferometry |
| TDI | Transportation Displays, Inc. (est. 1993; New York) |
| TDI | Therapeutic Donor Insemination |
| TDI | Truck Driver Institute (Murfreesboro, TN) |
| TDI | Toyota Direct Ignition |
| TDI | Trusted Database Interpretation |
| TDI | Transport Data Interface |
| TDI | Transition Dyspnea Index |
| TDI | Tropical Disease Initiative |
| TDI | Technicolor Digital Intermediates |
| TDI | The Duller Image (webcomic) |
| TDI | Total Degree of Influence (computer science) |
| TDI | Taiwan Display, Inc. |
| TDI | Tactical Display Interface (US FEMA) |
| TDI | Triangle Digital INX (ink manufacturer; Schaumburg, IL) |
| TDI | Team Dance Illinois (Geneva, IL) |
| TDI | Turbo Diesel Intercooled |
| TDI | Technical Group of Independent Members |
| TDI | Target Data Inventory |
| TDI | Technical Data Interchange |
| TDI | Tangerine Dream International (music label) |
| TDI | Telephone-Depth-Interviewing (market research methodology) |
| TDI | Training Development Institute |
| TDI | The Darkness Inc (gaming clan) |
| TDI | Transmitted Data In |
| TDI | Transit Delay Indication |
| TDI | Tamper Detection Indicator |
| TDI | Tie Down Information (telecommunications) |
| TDI | Target Doppler Indicator |
| TDI | Thai Dairy Industry Co. Ltd. |
| TDI | Technological Development of Information-Processing Co., Ltd. (Japan) |
| TDI | Tactical Deception Indication |
| TDI | Targeted Development Investment (finance; South Africa) |
| TDI | Time-Dependent Failure Intensity |
| TDI | Top Down Indicator |
| TDI | Tacan Distance Indicator |
| TDI | Telephone Database Integration |
| TDI | Türkiye Denizcilik Isletmeleri A.S. (Turkish Maritime Organization, Turkey) |