MID or Mid may refer to:

• MapInfo Interchange Format; .mid is also sometimes used as the filename extension for some MapInfo files
• Media Identification Code (MID code), a code indicating the manufacturer of a DVD
• Mobile Internet device, a category of mobile computer
• Molded Interconnect Device, an injection molded thermoplastic part with integrated electronic circuit traces
• Multiple interface declaration, a construct in some computer programming languages
• Musical Instrument Digital Interface: .mid is sometimes used as an alternate filename extension for MIDI files

A member of the armed forces mentioned in dispatches (or despatches, MiD) is one whose name appears in an official report written by a superior officer and sent to the high command, in which is described his or her gallant or meritorious action in the face of the enemy.