MEX or Mex may refer to: Places Mexico, a country in the southern portion of North America State of Mexico Mexico City Mexico City International Airport, IATA airport code MEX Mex, Valais, Switzerland Mex, Vaud, Switzerland Mexborough railway station, England, station code MEX Maju Expressway (MEX), an expressway in Kuala Lumpur, Malaysia People Mex Urtizberea (born 1960), Argentine musician and actor Byron Johnson (baseball) (1911–2005), also known as Mex Johnson, American baseball player Other uses Mex (mathematics), in game theory MEX (windowing system), computer software MEX file, a type of C/C++ or FORTRAN source code in MATLAB scripts Mars Express, a space exploration mission Boyd Martin Theatre, or The MeX, in The Kentucky Center, Louisville, Kentucky, U.S.