| Abbreviation | Definition |
|---|---|
| MPGA | Missouri Propane Gas Association |
| MPI | Master Painters Institute |
| MPMS | Massachusetts Podiatric Medical Society |
| MPN | Minority Professional Network |
| MPTA | Mechanical Power Transmission Association |
| MRA | Marketing Research Association |
| MRAC | Magazine Retail Advisory Council |
| MRC | Medical Research Council |
| MRICS | Member of the Royal Institute of Chartered Surveyors |
| MROC | Mortgage Recruiters Of Colorado |
| MRPI | Mentally Relevant Product Information |
| MRSP | Meter Reading Service Providers |
| MSADA | Maryland State Athletic Directors Association |
| MSADA | Massachusetts State Automobile Dealers Association |
| MSCA | Massachusetts Systems Contractors Association |
| MSCA | Mechanical Service Contractors of America |
| MSCA | Mechanicsburg Supply Corps Association |
| MSCE | Michigan Society for Clinical Engineering |
| MSCH | Michigan Society of Clinical Hypnosis |
| MSCH | Minnesota Society of Clinical Hypnosis |