| Abbreviation | Definition |
|---|---|
| LIEP | Liaoning Integrated Environmental Programme |
| LIFE | Learning Interdependently For the Environment |
| LLBG | Low Level Burial Ground |
| LLDA | Laguna Lake Development Authority |
| LLM | Liner Location risk and cost analysis Model |
| LLRW | Low-Level Radioactive Waste |
| Lm | Meander length or river or stream |
| LMNC | Lookout Mountain Nature Center |
| LNWT | Low and Non-Waste Technology |
| LOER | Laboratory for Oceanographic and Environmental Research |
| LOF | Limited Operational Flexibility |
| LOP | Local Oversight Program |
| LOSC | Letter Of Substantial Compliance |
| LOSC | Louisiana Office of State Climatology |
| LPAC | Light Pollution Abatement Committee |
| LPDES | Louisiana Pollution Discharge Elimination System |
| LPL | Limited Pollution Liability coverage |
| LPR | Light Pollution Reduction |
| LPRCA | Long Point Region Conservation Authority [Ontario, Canada] |
| LPS | Light Pollution Suppression |