DXX may refer to:
520 (number), in Roman numerals, a number in the 500s range 520 AD (DXX), a year of the Common Era Lac qui Parle County Airport (FAA airport code ), Lac qui Parle County, Minnesota, USA State Security Service (Uzbekistan) (DXX, ) DXX, a variant, a fork of the videogame Descent (video game)
See also
520 (disambiguation), where "DXX" is '520' in Roman numerals D20 (disambiguation), where "XX" is '20' in Roman numerals DX10 (disambiguation), where "X" is '10' in Roman numerals
DXXX (disambiguation) DX (disambiguation) DDX (disambiguation)