| Acronym | Definition |
|---|
| TLL | Tool Lending Library (California) |
| TLL | The Learning Lab (Singapore) |
| TLL | Task Library Language |
| TLL | Temasek Life Sciences Laboratory (Singapore) |
| TLL | Thesaurus Linguae Latinae |
| TLL | This Little Light |
| TLL | Taylor Ladder Logic |
| TLL | Tau Lambda Lambda (fraternal organization; various locations) |
| TLL | Terra Lliure (Free Land; Catalan nationalist group) |
| TLL | Tallinn, Estonia - Ulemiste (Airport Code) |
| TLL | Totally Looks Like (Internet slang) |
| TLL | The Low Life (band) |
| TLL | Target Locator Line |
| TLL | Teaching & Learning Laboratory (Massachusetts Institute of Technology) |
| TLL | Tender Load List |
| TLL | Time-Lock Loop |
| TLL | Télévision Locale de la Loire (French: Local TV Loire; Loire, France) |