| Abbreviation | Definition |
|---|---|
| MPH | Mennonite Publishing House |
| MPH | Methodist Publishing House |
| MPHC | Mesaieed Petrochemical Holding Company |
| MPI | Manitoba Public Insurance |
| MPI | Martinross Pianos Inc. |
| MPI | Master Planners International |
| MPI | Meeting Planner International |
| MPI | Meeting Professionals International |
| MPIC | Metro Pacific Investments Corporation |
| MPIC | Mississippi Prison Industries Corporation |
| MPIL | Marker Panel Individual LW |
| MPJ | Micro-ProJects |
| MPK | Michaelis Pfeifer König |
| MPL | McCartney Productions Ltd |
| MPL | McCartney Publishing Limited |
| MPL | Minox Processing Laboratory |
| MPLC | Motion Picture Licensing Corporation |
| MPLI | Minnesota Prairie Line, Inc |
| MPLX | Modern Power Logistics Company |
| MPM | Machining, Programming and Manufacturing Services |