| Acronym | Definition |
|---|
| TGI | Tribunal de Grande Instance (French: High Court) |
| TGI | Triumph Group Inc. |
| TGI | TIGR (The Institute for Genomic Research) Gene Index |
| TGI | Target Group Index |
| TGI | Tower Group, Inc. (New York) |
| TGI | Tracheal Gas Insufflation |
| TGI | Terasen Gas, Inc. (Canada) |
| TGI | Trumpet Geeks International (resource) |
| TGI | Thank God It's Friday (US restaurant chain) |
| TGI | Teaching Goals Inventory (various schools) |
| TGI | The Governance Institute (San Diego, CA) |
| TGI | Tumor Growth Inhibition |
| TGI | Tobacco Genome Initiative |
| TGI | Targus Group International (various locations) |
| TGI | Trato Gastrointestinal (Portugese) |
| TGI | The Game Initiative |
| TGI | Tide Gauge Inspectorate |
| TGI | IEEE 802.11i Task Group |
| TGI | Tôlerie Ganaye Industrie (French: Ganaye Sheet Metal Industry) |
| TGI | Talent Growth International (India) |
| TGI | Task Group Instruction (US Navy) |
| TGI | Thyroid Growth-stimulating Immunoglobulin |
| TGI | Transportadora de Gas del Interior SA (Colombia) |
| TGI | Tire Guides, Inc. |
| TGI | Travel Guard International Insurance Brokerage, Inc. |
| TGI | Task Group Index |
| TGI | Technical Guidance Instruction |
| TGI | Techniques Gestion Informatique (French: Technical Information Management) |
| TGI | Temperature Growth Index |