| Abbreviation | Definition |
|---|---|
| LWCBL | Little Walnut Creek Branch Library (Austin, TX) |
| LWG | Library Working Group |
| LWGQ | Learning With Growing Quality |
| LWJGL | Light Weight Java Game Library |
| LWJGL | Light Weight Java Graphics Library |
| LWLHL | Leisure World Laguna Hills Library (Laguna Hills, CA) |
| LWP | Library for WWW in Perl |
| LWW | Library of the Written Word |
| M | Meaning |
| M&MWR | Morbidity and Mortality Weekly Report |
| MABLE | Module Authentication and Binding Library Extensions |
| MAG | MAGazine |
| MAGIRT | Map and Geospatial Information RT |
| MALA | Mid America Library Alliance |
| MALF | Minnesota Association of Library Friends |
| MALF | MN Association of Library Friends |
| MALL | Minnesota Association of Law Libraries |
| MALP | Mexican American Library Program |
| MASL | Maine Association of School Libraries |
| MBDL | Million Book Digital Library |