EMX or EmX may refer to: emx+gcc, a DOS extender and DOS and OS/2 programming environment Emx (underground car) Emerald Express (EmX), a bus rapid transit system in Lane County, Oregon EuroManx, a defunct airline which held ICAO airline designator EMX El Maitén Airport, an airport in Argentina which has IATA airport code EMX Electribe EMX, music production station by Korg See also EMX1, a human gene EMX2, a human gene