| Abbreviation | Definition |
|---|---|
| LAMP | Lighthouse Archaeological Maritime Program |
| LB | Late Bronze age |
| LEGXX | LEGion Twentieth (The Roman force 19 AD) |
| LEGXXVV | Legio Vicesimae Valeria Victrix (The Twentieth Legion, Valiant, and Victorious ) (The Roman force 19 AD) |
| LOPA | Laboratory Of Public Archaeology |
| LUAS | Luasllano Uplift Archaeological Society |
| MAA | Museum of Art and Archaeology |
| MAAC | Mid Atlantic Archaeology Conference |
| MAAC | Middle Atlantic Archaeological Conference |
| MAC | Marine Archaeology Centre |
| MADU | Malvern Archaeological Diving Unit |
| MAHS | Meath Archaeological and Historical Society |
| MAML | Mobile Archaeological Microforensic Laboratory |
| MAPA | Master of Arts in Public Archaeology |
| MAPA | Master of Arts Public Archaeology |
| MAPS | Manuscripts, Archaeology, Prophecy, and Statistics |
| MIAT | Museum for Industrial Archaeology and Textile |
| MIMA | Muon Imaging for Mining and Archaeology |
| MOLA | Museum of London Archaeology |
| MTAP | Molyvoti Thrace Archaeological Project |