| Abbreviation | Definition |
|---|---|
| MRP | Most Recent Phoenix |
| MRPE | Maryland Recovery Plan for Education |
| MRT | Migrant Resource Teacher |
| MRTA | Maple Ridge Teachers' Association |
| MRTA | Missouri Retired Teachers Association |
| MRTS | Medieval and Renaissance Texts and Studies |
| MRW | Mathematics Revision Week |
| MS | Millennial Star |
| MSA | Maryland School Assessment |
| MSA | Metropolitan Statistical Area |
| MSAN | Minority Student Achievement Network |
| MSAP | Magnet Schools Assistance Program |
| MSAP | Model School Adjustment Program |
| MSAT | Manegement School Admission Test |
| MSAT | Multipule Subject Assessment for Teachers |
| MSBOA | Michigan School Band and Orchestra Association |
| MSC | Math Study Center |
| MSCN | Middle School College Night |
| MSCR | Madison School & Community Recreation |
| MSD | Most Safe Dress code |