MCI may refer to:
Organizations
Companies
- MCI Communications, originally Microwave Communications Inc., the corporation that operated as MCI from 1963 to 1998
- MCI Inc., formerly called WorldCom, which acquired MCI Communications, and was later acquired by Verizon Communications
- MCI Group, a global event, association management and congress management company
- Mobile Telecommunication Company of Iran, the largest mobile phone operator in Iran
- Motor Coach Industries, a coach/bus manufacturing company
- Music Center Incorporated, later known as Music Consultants Incorporated, a company that manufactured multi-track audiotape recorders and mixing consoles for professional studio recording
- Music Collection International, the music division of Video Collection International
- MCI, Frank Farian's record label
Education
- Maine Central Institute, a boarding school in Maine, US
- Marine Corps Institute, a coursework of Marine Corps education and training programs
- Martingrove Collegiate Institute, a secondary school located in Toronto, Ontario, Canada
- MCI Management Center Innsbruck, a privately organized business school in Innsbruck, Austria
- Medical Council of India, a statutory body regulating medical education in India
- Mennonite Collegiate Institute, a private, religious school in the town of Gretna, in Southern Manitoba
- Middlefield Collegiate Institute, a secondary school located in Markham, Ontario, Canada
- Museum Conservation Institute, of the Smithsonian Institution
Other organisations
- Ministry of Communications and Information, a ministry of the Government of Singapore
- Motek Cultural Initiative, a Toronto-based nonprofit organization promoting Israeli music and culture
Science and technology
- Millicurie (mCi), 1/1000 of a curie, a non-SI unit of radioactivity
- Megacurie (MCi), 1,000,000 times a curie, a non-SI unit of radioactivity
- Macroinvertebrate Community Index, an index where the presence or lack of macroinvertebrates is used for monitoring stream health in New Zealand
- Magnetic current imaging, using a scanning SQUID microscope
- Malicious caller identification, a type of enhanced telephone service
- Mass-casualty incident, a medical emergency involving more patients than can be easily handled by the crews initially assigned to the incident
- Media Control Interface, an API for controlling multimedia peripherals connected to a Microsoft Windows or OS/2 computer
- Meta-circular evaluator, in computing
- Mild cognitive impairment, a neurological affliction often associated with Alzheimer's disease
- Modulation contrast imaging, a term related to optical transfer function
Arts, entertainment, and media
- MasterChef Indonesia, an Indonesian televised cooking competition
Other uses
- 1101 in Roman numerals
- Kansas City International Airport (IATA airport code), Kansas City, Missouri, US
- Meal, Combat, Individual ration, the successor to the US Army C-ration
- Michigan City station (Amtrak station code), Indiana, US
- Miss Chinese International Pageant, an annual pageant for international women of Chinese descent
- Monetary conditions index, a macroeconomic index number relevant for monetary policy
- Short name for Manchester City F.C.
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