MPI or Mpi may refer to:
Science and technology Biology and medicine Magnetic particle imaging, a tomographic technique Myocardial perfusion imaging, a medical procedure that illustrates heart function Mannose phosphate isomerase, an enzyme Mass psychogenic illness, the rapid spread of illness symptoms where there is no infectious agent Master patient index, an index referencing all patients Multidimensional Pain Inventory, a pain medicine assessment questionnaire
Computing Marburg Picture Index, online database of photographs of artworks Merchant plug-in, software used to prevent credit card fraud on e-commerce sites Message Parsing Interpreter, a Lisp-like language on TinyMUCK Message Passing Interface, a communications protocol for parallel computation Multi-Point Interface, an automation programming protocol from Siemens Multipath interference, a physical effect that causes signal degradation in communication systems Multiple precision integer, a programming language type supporting arbitrary precision
Other science and technology Magnetic particle inspection, a method of detecting defects in ferrous materials Multi point injection, fuel injection system for automobile engines Maximum potential intensity, a meteorology term associated with tropical cyclones
Companies and organizations Magnetic Peripherals Inc., a Control Data Corporation subsidiary renamed Imprimis and sold to Seagate Technology Manitoba Public Insurance, a Crown corporation in Manitoba Materials Processing Institute, a company providing industrial R&D services based in the UK Max Planck Institute, Germany Metro Pacific Investments Corporation (MPIC), a Filipino investment holding company Migration Policy Institute, Washington, DC Mihajlo Pupin Institute, Serbia Ministry for Primary Industries, New Zealand Ministry of Planning and Investment, Vietnam Mission Pictures International, a foreign sales, finance, and distribution company MotivePower, a locomotive manufacturer and rebuilder Moving Picture Institute, an American non-profit organization and film production company MPI Media Group, an American home entertainment company
Other uses Mpi language, a language of Thailand Mpi people, an ethnic group from Thailand Mariposa-Yosemite Airport (FAA location identifier), California, US Milanka Price Index, a stock index in Sri Lanka Multidimensional Poverty Index, used by the UNDP