MMX may refer to:
2010, in Roman numerals
Science and technology MMX (instruction set), a single-instruction, multiple-data instruction set designed by Intel MMX Mineração, a Brazilian mining company Martian Moons eXploration, a Japanese mission to retrieve samples from Mars' moon Phobos Michelson–Morley experiment, an 1887 physics experiment
Places MMX Open Art Venue, in Berlin, Germany Malmö Airport, Sweden (IATA code)
Arts and entertainment Music "MMX (The Social Song)", a 2010 song by Enigma MMX (Twelfth Night album), 2010 Napalm (album), original working title MMX, a 2012 album by Xzibit MMX, a 2012 album by Procol Harum MMX, a 2010 album by War from a Harlots Mouth Marble Machine X, a musical instrument designed by Swedish band Wintergatan
Video games Mega Man X, a series of video games, and its main character Might & Magic X: Legacy, a 2014 role-playing video game