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MCI may refer to:



  • MCI Group, a global event, association management and congress management company
  • MCI Inc., formerly called WorldCom, which acquired MCI Communications, and was later acquired by Verizon Communications
  • MCI Communications, originally Microwave Communications Inc., the corporation that operated as MCI from 1963 to 1998
  • 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
  • MCI, Frank Farian's record label


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