| Acronym | Definition |
|---|
| TLG | The Little Gym (Oakville, ON, Canada) |
| TLG | Through the Looking Glass |
| TLG | Thesaurus Linguae Graecae (project, UC Irvine, California) |
| TLG | The Lost Generation |
| TLG | The LEGO Group |
| TLG | The Last Guardian (video game) |
| TLG | The Lighthouse Group (various locations) |
| TLG | The Lone Gunmen |
| TLG | The Living God |
| TLG | Technology Learning Group (Bellevue, WA) |
| TLG | Technology Law Group, LLC (Washington, DC and Oklahoma City, OK) |
| TLG | Technical Liaison Group |
| TLG | The Livingston Group LLC (Washington, DC) |
| TLG | The Loyalty Group (California) |
| TLG | Two-Level Grammar |
| TLG | Teaching and Learning Grant (various organizations) |
| TLG | Traffic Load Generator |
| TLG | Tail Landing Gear (aviation) |
| TLG | The Lost Guys (Counter-Strike Clan) |
| TLG | Tianjin Licorne Garments (China) |