| Abbreviation | Definition |
|---|---|
| MSWB | Maschinenverleih Spultechnik Wassertechnik Bestectverleih |
| MSWC | Madera Solid Waste Consulting |
| MSWC | Maharashtra State Warehousing Corporation |
| MSWD | Mustard Seed Web Design |
| MSWL | Myles, Stacey, Wyatt, Land |
| MSWL | Myles, Stacey, Wyatt, & Land |
| MSY | Moisant Stock Yards |
| MSYG | Middle School Youth Group |
| MSZ | Maunsell, Sharma, & Zakaria - Consulting Engineers |
| MT | Master Tools |
| MT | Mattachu Translations |
| MT | Micron Technologies |
| MT | Micron Technology |
| MT | Mold-Tech |
| MT | Music Trader |
| MTA | Maryland Transit Administration |
| MTA | Matanuska Telephone Association |
| MTA | Microsoft Transfer Agent |
| MTA | MoreTrench American Corporation |
| MTAF | More Than a Friend (creative studio) |