| Abbreviation | Definition |
|---|---|
| MSEF | Mahomet Seymour Education Foundation |
| MSEF | Manitou Springs Education Foundation |
| MSEF | Medford Ski Education Foundation |
| MSEF | Millennia Scope Entertainment Foundation |
| MSEF | Motorsports Safety Education Foundation |
| MSEF | Mount Sneffels Education Foundation |
| MSF | Muhammad Subuh Foundation |
| MSLF | Missouri Scholarship Loan Foundation |
| MSOF | Mama Sarah Obama Foundation |
| MSRF | Macpherson Smith Rural Foundation |
| MSRF | Methow Salmon Recovery Foundation |
| MSTF | Maine Science and Technology Foundation |
| MSTF | Memphremagog Ski Touring Foundation |
| MSTF | Missouri State Teachers Foundation |
| MSVF | Medical Society of Virginia Foundation |
| MTCF | Mahmud Tarzi Cultural Foundation |
| MTEF | Manchester Township Educational Foundation |
| MTEF | Manheim Township Educational Foundation |
| MTEF | Mequon Thiensville Education Foundation |
| MTEF | Milwaukee Tennis and Education Foundation |