MPI may stand for:

Companies

• Metro Paper Industries Tissue Group, a paper manufacturer and converter of away-from-home products operating in Canada and the United States with head office in Toronto, Canada.
• Miles Pendleton Images, Photography Company in Orange County, CA
• Motive Power Industries, a locomotive manufacturer
• MPI Home Video
• MPI Research, a privately held medical research contract organization in Michigan

Research institutes

• Max-Planck-Institut, elite scientific research institutes in Germany
• Metal Processing Institute
• Mihajlo Pupin Institute, ICT research institute based in Belgrade, Serbia

Science, information technology and engineering

• Multi Point Injection, Technical by Automobile Engine
• Magnetic Particle Imaging, an imaging technique still being developed
• Magnetic-particle inspection, a non-destructive method used to detect defects in ferrous materials.
• MultiPhoton Imaging, a technique used in nuclear medicine, chemical physics and molecular biology
• Mandatory Periodic Inspection, an important maintenance requirement for aircraft engines
• Message Passing Interface, a computer communications protocol for parallel computation
• Message Parsing Interpreter, a lisp-like language on TinyMUCK
• Multi Point Interface, an automation programming protocol from Siemens
• Master Patient Index, an index referencing all patients

Documentation

• Manufacturing Process Instructions, quality control and production documentation file/book name including complete "how to" assembly instructions

Other

• The FAA location identifier for Mariposa-Yosemite Airport.
• Meeting Professionals International
• Mental Performance Index, first ever mental scoring system in sport by Dr. John F. Murray
• Micropirates Incorporated, an underground computer crime organization active from 1988 to 1998
• Military Police Investigations

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