| Acronym | Definition |
|---|
| MPI | Meeting Professionals International |
| MPI | Message Passing Interface |
| MPI | Migration Policy Institute (Washington, DC) |
| MPI | Max-Planck-Institut (Institutes of the Max-Planck-Gesellschaft; Germany) |
| MPI | Magnetic Particle (Powder) Inspection |
| MPI | Master Patient Index (health care) |
| MPI | Magnetic Particle Inspection |
| MPI | Ministry of Planning and Investment (Vietnam) |
| MPI | Myocardial Perfusion Imaging |
| MPI | Master Painters Institute |
| MPI | Ministero della Pubblica Istruzione (Italy) |
| MPI | Moldflow Plastics Insight (injection molded components) |
| MPI | Meeting Planners International |
| MPI | Multi-Point Injection |
| MPI | My Point Is |
| MPI | Mineral Policy Institute |
| MPI | Multiphoton Ionization |
| MPI | Mean Point of Impact |
| MPI | Mannose phosphate isomerase |
| MPI | Medisch Pedagogisch Instituut |
| MPI | Mass Psychogenic Illness |
| MPI | Military Police Investigator |
| MPI | Milanka Price Index (CSE, Sri Lanka) |
| MPI | Multiple Protocol Interface (computer networking) |
| MPI | Metal Processing Institute (Worcester Polytechnic Institute, Worcester, MA) |
| MPI | Multi Photon Ionization |
| MPI | Multi-Path Interference |
| MPI | Manitoba Public Insurance Corporation |
| MPI | Major Periodic Inspection (aviation industry) |
| MPI | Medizinisch-Psychologisches Institut (Germany) |
| MPI | Micro Planning International (various locations) |
| MPI | Multi Point Inspection |
| MPI | Motive Power Industries |
| MPI | Minimum Picture Interval |
| MPI | Marginal Propensity to Invest |
| MPI | Management Performance Indicator |
| MPI | Martin-Puplett Interferometer |
| MPI | Maximum Permitted Intake (EPA) |
| MPI | Mail Processing Infrastructure (US Postal Service) |
| MPI | Maximum Possible Intensity |
| MPI | Murray Performance Index |
| MPI | Market Penetration Index (economics) |
| MPI | Marine Pollution Incident |
| MPI | Multi-dimensional Pain Inventory |
| MPI | Multiple Page Interface (web pages) |
| MPI | Multisport Performance Institute (Pensacola, FL) |
| MPI | Multiple Power Input |
| MPI | Multi-Processor Interconnect |
| MPI | Mobile Positioning Initiative (US Army) |
| MPI | Mile Post Identification |
| MPI | Model Plant Initiative |
| MPI | Message-Passing Iterative (decoding) |
| MPI | Menu Port Interface |
| MPI | Maintenance Performance Indicator (US Air Force) |
| MPI | Micro Pilot Ignition (gas engines using diesel fuel) |
| MPI | Manufacturing Processing Instructions |
| MPI | Multi-Service Packet Interface |
| MPI | MicroPirates, Incorporated (international computer crime organization active in the 1990s) |
| MPI | Melrose Pyrotechnics, Inc. (Kingsbury, Indiana) |
| MPI | Multimedia Production Integration |
| MPI | Military Procurement International (Defence & Aerospace Publishing Services (Switzerland)) |
| MPI | Mutually Preferentially Independent (computer programming) |
| MPI | Multivariable Proportional-Integral (Controller) |
| MPI | Multi Purpose Initiator |
| MPI | Micro Pulse, Incorporated (manufacturer of GPS and wireless antennas) |
| MPI | Medical Pedagogical Institution (Belgium) |
| MPI | Metal Particle Interconnect |
| MPI | Maitake Products, Inc. (Lyons, CO) |
| MPI | Motion Picture Institute (Troy, MI) |
| MPI | Mathematics, Physics and Informatics (various schools) |
| MPI | Manufacturing Performance Institute (Shaker Heights, OH) |
| MPI | Motion Picture Imaging |
| MPI | Magnetic Peripherals, Incorporated |
| MPI | Mechanical Piping Isometrics |
| MPI | Milk Producers, Inc. (est. 1967) |