| Acronym | Definition |
|---|
| LLI | Low-Level Indicator (medical alarm system) |
| LLI | Local Level Institutions (World Bank study) |
| LLI | Local Lorentz Invariance (physics) |
| LLI | Logical Link Identifier |
| LLI | Low Latency Interface (mobile devices) |
| LLI | London Language Institute (London, Ontario, Canada) |
| LLI | Liberty League International (Scottsdale, Arizona) |
| LLI | Library Leadership Institute (various locations) |
| LLI | Lower Layer Interface |
| LLI | Lifelong Learning Institutes |
| LLI | Leg Length Imbalance |
| LLI | Liberty Legal Institute (est. 1997; Arlington, VA) |
| LLI | Lake Lanier Islands (Georgia) |
| LLI | Little League International |
| LLI | Limited Life Item (US NASA) |
| LLI | Long Lead Item |
| LLI | Laubach Literacy International |
| LLI | Latitutde and Longitude Indicator (US Navy) |
| LLI | Leveraged Loan Index (finance) |
| LLI | Low Latent Inhibition |
| LLI | Lower Layer Information |
| LLI | Logical Link Interface |
| LLI | Link Layer Interface |
| LLI | Low-Level Injection |
| LLI | Low Level Intercept |
| LLI | Low-Level Intrusion |
| LLI | Language, Literature, Identity (Conference) |