MPI or Mpi may refer to:

Ethnic group[link]

• Mpi people, an ethnic group from Thailand

Science, information technology and engineering[link]

• Magnetic particle imaging, an imaging technique still being developed
• Magnetic-particle inspection, a non-destructive method used to detect defects in ferrous materials
• Mandatory periodic inspection, an important maintenance requirement for aircraft engine
• Manufacturing Process Instructions, quality control and production documentation file/book name including complete "how to" assembly instructions
• Maximum potential intensity, a meteorology term associated with tropical cyclones
• Merchant plug-in, software used to help prevent credit card fraud on e-commerce sites
• Message Parsing Interpreter, a lisp-like language on TinyMUCK
• Message Passing Interface, a computer communications protocol for parallel computation
• Multiple precision integer, a programming language type supporting arbitrary precision
• Multi point injection, fuel injection system for automobile engines
• Multi Point Interface, an automation programming protocol from Siemens
• Multiphoton imaging, a technique used in nuclear medicine, chemical physics and molecular biology
• Miss Per Instruction, cache miss per instruction, used in CPU architecture.

Medicine[link]

• Malaria Prevention Initiative, a Community Development Service Project of the National Youth Service Corps, Nigeria
• Mass Psychogenic Illness, the rapid spread of illness signs and symptoms affecting members of a cohesive group
• Master Patient Index, an index referencing all patients
• Mental Performance Index, first ever mental scoring system in sport by Dr. John F. Murray
• Multidimensional Pain Inventory, a pain medicine assessment questionnaire
• Mannose phosphate isomerase

Research institutes[link]

• Max Planck Institute, scientific research institutes in Germany
• Metal Processing Institute
• Migration Policy Institute, a human migration research institute based in Washington, D.C.
• Mihajlo Pupin Institute, an ICT research institute based in Belgrade, Serbia
• The Moving Picture Institute, an American non-profit organization and film production company

Other[link]

• Manitoba Public Insurance, a non-profit Crown corporation based in Manitoba
• The FAA location identifier for Mariposa-Yosemite Airport
• Mean point of impact
• Meeting Professionals International, a professional community for the global meetings industry
• Military Police Investigations
• Motive Power, Inc., locomotive manufacturer based In Boise Idaho.
• Movimiento Pro-Independencia, the Puerto Rican Pro-independence Movement
• Multidimensional Poverty Index, used by the UNDP

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