| Abbreviation | Definition |
|---|---|
| LLV | Long-Life Vehicle |
| LN | Lane |
| LOT | Line-Of-Travel |
| LOWR | Lower |
| LP | Loop |
| LPC | Label Printing Center |
| LR | Liberia |
| LS | Lesotho |
| LSM | Letter Sorting Machine |
| LT | Lithuania |
| LT | Lot |
| LTATS | Loan, Transfer, and Training System |
| LU | Luxembourg |
| LUR | Labor Utilization Report |
| LV | Latvia |
| LY | Libya |
| MA | Morocco |
| MASS | Multiline Accuracy Support System |
| MB | ManitoBa |
| MBMC | Memphis Bulk Mail Center |