| Abbreviation | Definition |
|---|---|
| LRBM | Load Restricted Bridge Map |
| LRBP | Local Road Bridge Program |
| LRCA | Lakehead Region Conservation Authority [Ontario, Canada] |
| LRP | Land Recycling Program |
| LRS | Lakeshore Recycling Systems |
| LRV | Leak Repair Verification |
| LSA | Landscape Sensitivity Assessment |
| LSEMP | Lake Scugog Environmental Management Plan [Ontario, Canada] |
| LSPP | Lake Simcoe Protection Plan |
| LSRCA | Lake Simcoe Region Conservation Authority [Ontario, Canada] |
| LST | Liquid Storage Tank |
| LTC | Lower Trent Conservation (Authority) [Ontario, Canada] |
| LTE | Less Than Effective |
| LTMO | Long Term Monitoring Optimization |
| LTOEL | Long-Term Occupational Exposure Limit |
| LTR | Learn To Return |
| LTR | Liberty Tire Recycling |
| LTVCA | Lower Thames Valley Conservation Authority [Ontario, Canada] |
| LTW | Lake Tahoe Water |
| LUEL | Lakehead University Environmental Laboratory |